Below are the Chapter Master Patch Notes in our Lord Dukes Own Writing.
Latest patch is at the top.
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0.6533

Major Changes:
Added in a new Debug Log that has events written to it as they occur, such as ground and space combat, random events, etc.  Upon a crash, or experiencing weird behavior, this debug_log.ini file should be sent to the usual email.  And probably deleted afterwards for a fresh version.

Other Changes:
Some heavy ranged weapons have been increased in price.
Fixed the 'explode string' crash on game launch.  I think.
Post fleet combat 'ship_lost' crash has been fixed.
Added a couple more colors to chapter livery.
Captains are now assigned Bolt Pistols instead of Bolters by default.
Some Chapter Advantages and Disadvantages are mutually exclusive once more.
Finished Paragon and Reverent Guardians advantages.
Psykers can once more use their weapons between casting to tear shit up.
Built Land Raiders and Land Speeders now have their default weapons included.
Fixed combo space battles; they should now be able to occur.
Gene-Seed tithes are now a thing! :D  You automatically hand over 5% of your Space Marine gravy every two years (minimum 1), or if unable, take a small Loyalty hit and build up an IOU.
Trading away or selling Gene-Seed can have repercussions now.
You can no longer select marines from several companies, as this was not intended and doing nothing but causing errors.
Planets should no longer jump off the screen at the end of the turn.
You may no longer Attack Space Hulks.  Raid and Bombard should be the only options.
Malcador Spyrer Web Spinners now use a more complex formula for incapacitation.
Some missing dialogue has been added.
Planetary Governors will no longer ask for help if player forces are already present.
Planetary Governors can no longer ask for help the same turn the enemy forces are removed.
'Daemon Binders' changes power text violet rather than the normal blue.

Other:
Messed around with the Marine Damage Resistance formula a lot and determined that it works fine as is.  Variants tried involved different Damage Multiplier, removing half the armor from the starting damage and end damage, and so on.  If anyone wishes to mathhammer it themselves and try to find a better formula it currently works as follows:
-Damage Multiplier: 0.7 - ((Marine Experience * Marine Experience) /40000), minimum of 0.25         Displayed damage resistance is ((1 - Damage Multiplier) * 100)%
-Damage Result: (Damage * Damage Multiplier) - Marine Armor

-----------------------------------
0.6532

Major Changes:
The top right 'Options' has been replaced with 'Help', which offers additional info on various topics. Taking suggestions in the GoogleDoc, towards the bottom.

Other Changes:
Assault Cannons are now 1H for Terminators, as was intended.
Fixed a crash with Fleet Combat.
Fixed the 'scr_powers_new' crash on chapter creation.
You may no longer raid with vehicles, you damn Blood Angel.
Supporters are now listed in the About/Credits page.
Saving now takes into account fleet orbits, allowing fleets on future saves to act on the first turn the game is loaded.
You may no longer get free Licenses or Recruiting Worlds if there is no valid origin/destination for the trade fleet.
Baseline planet disposition is now saved. In future saves, upon loading, ???? disposition planets will not start a very low number.
Attacking with Local Forces is once more functional.
Hunt the Fallen can now have the mission timer increased by a local Warp Storm.
You no longer have to click/enter a key twice to close out of a popup.
-----------------------------------
0.6531

Major Changes:
The Raid and Attack panels have been updated.
Stars can no longer be empty.
Saving and Loading should now be bug-free.
Power Fists and Chain Fists now also use up a ranged hand slot.

Other Changes:
Added in the 'Debug Mode' cheat.
Fixed a bug where stars would jump off the map.
Fixed a bug where control of the home planet could permanently change to the Imperium.
Planetary Governors now request military assistance.
Planetary Governor post-assassination options have been restored.
Fixed the crash upon entering the Load and Save screen.
Save games now properly show their screenshot.
You may now sit upon your throne.  You egoist, you.
Rune Magick discipline has been fixed.
Fixed a crash when fighting Mechanicus sentries for STC Fragments.
The 'Hunt the Fallen' mission is now completable.
Dark Angel's THE ROCK no longer becomes Imperium Controlled after turn 1.
Fixed a bug preventing Psykers from using attack powers.
Fixed a bug that would prevent Psyker Powers from being displayed.
Custom chapters over 5 Strength now have bonus Astartes, as was intended.
Necron-owned stars will no longer generate a 'taken over by Tau' message every turn if Tau are present.
"Capture a Gaunt" mission no longer overrides Tyranid Space Hulk battles.
The Purge Dissenting Nobles mission completion no longer appears twice in the event log.
The Lair Forge is no longer mentioned twice in lair descriptions.
The first Necron Tomb excursion popup is no longer instantly skipped.
Company Champions now count as part of the command squad.
Promoted marines may now be viewed in management.
Dreadnoughts have been given the 'Strength' attribute, and as such are no longer penalized for using two two-handed weapons.
When promoting to a Dreadnought, non-compatible weapons and equipment are now taken off.
Promoting marines to DoNotChange no longer deletes them.
Bolter Drilling bonuses now appear with highlighted marines' weapons.
Dreadnoughts are now promotable to Venerable Dreadnoughts at 400 exp.
Save games may once more be deleted.
Vehicles no longer appear undecupled when attacking from space.
Crusades are slightly less fatal.
Company Champions should no longer be eligible for becoming Librarians.
Librarian Aspirants may now also be taken from 2nd company.
Attack, Raid, and Bombard are now possible against inhabited Dead worlds.
Terminator legs are now colored properly with Quadrant style.
Equipping Terminator or Dreadnought armors/artifacts now removes any mobility items from that marine.
Fixed the Exterminatus result popup crash.
-----------------------------

0.6529

Major Changes:
The Attack/Drop selection script has been rewritten.  You may now Attack with vehicles directly from ships, as was intended.
Eldar Fleets and Craftworlds have been fixed; you may now fully interact with them.
You may now construct up to one Building on each empty Dead planet.  The current options are Lairs, Arsenals, and Gene-Vaults.

Other Changes:
Fixed a rare crash with exclamation mark Alerts.
You can no longer scroll the window around in ground combat.
Fixed the crashing upon finishing a space battle.
Resource popups no longer appear while zoomed out.
You can no longer click through Star/Planet selection and accidentally select a new planet or fleet.
The Inquisition has been given new flags for tracking of past offenses.

Other:
The trade crash appears finicky.  If you get an 'error dialogue' from a faction leader, after trading, mention if it is error #1 or error #2.

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0.6528

Major Changes:
Added a short timer to hitting Enter in combat.

Other Changes:
No more infinite Slaughtersongs.
Relic Blades are two-handed, as was originally intended.
Fixed another max Ship STC Fragment crash.
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0.6527

Major Changes:
The client technically, sort of starts in Windowed Mode and soon after changes to match settings.  The client should no longer hang for some players on startup this way.  Probably.
Primary and Secondary weapon names are no longer flipped in combat.

Other Changes:
The Welcome to Sector screen has been fixed.
Star Selection buttons with Space Hulks have been fixed.
Recruit bonus experience now properly saves.
You can no longer gift infinite STC Fragments.
Fixed a crash when opening the Promote popup
Psyker Chapter Masters now use powers as was intended.
Fully unlocked Ship STC Fragments no longer crashes the game when moving fleets.
Fleet and Penitent based chapters no longer start the game with control over their home star system.
The colors Sanguine and White have been fixed.
Fixed a crash when Trading.
Trade Fleets can no longer show up early (if Fleet or Penitent based) and lower their faction's disposition.  They can still chase the player fleet around and get irritated.
Fixed the Apothecarion crash.
Fixed the Ingame Menu left_mouse crash.
Fixed (probably) the dudes_num crash.
Fixed the 'clicking on a planet after buying a Recruiting World' crash.
The Ingame Menu should no longer become blank.
Necron Tombs can no longer awaken awaken awaken awaken awaken.
Player-controlled planets can be recolonized.
------------------------------------------------
0.652

Major Changes:
None.

Other Changes:
Fixed Star Selection; it now displays the correct Buttons.
You may now scroll by holding the cursor near the screen edge.
Fixed the Liverly Color crash.  God dammit.

------------------------------------------------
0.651

Major Changes:
Within settings you may now toggle Full Screen on or off.  Slightly wonky.

Other Changes:
Fixed the obj_popup right mouse crash.
Fixed the Reclusium crash.
Fixed the non-existent Tutorial crash.
The Management missing sprite crash should be fixed.
Fixed the customize role crash in Chapter creation.
The 'Unable to Draw Non-Existing Sprite' for saving/loading should be fixed.
Faction Leaders should be hidden until discovered once more.
Fixed being able to select new Recruiting Planets.
Fixed the 'Hover over Loyalty' crash.
Techmarines can be displayed outside of the HQ Company.
Forge Masters may recover STC Fragments, as was intended.
Fallen and Spyrers should now trigger battles correctly.


-----------------------------------
0.65

Major Changes:
Specialist marines no longer count towards the chapter size; chapters are larger as a result.
STC Fragments may be gifted or identified to grant bonuses.
Gene-Seed Test-Slave Incubators have been added to the Apothecarium.
Librarians have been buffed considerably- perils happen half as frequently, all attack powers do twice the damage, and buffs are only cast under particular circumstances.
Chapters may have up to four Advantages and Disadvantages.
Planetary Governors now have their own individual dispositions.
If a Planetary Governor likes your Chapter enough they grant bonus Requisition in the form of tribute.
Fleet Combat has been overhauled- it is now possible to have three or four-way battles.
The 'Attack' button, in Star Selection, now works.
Chapter Settings page has been added.  It is used to change company and Astartes settings, in addition to mass equipping Astartes.

Other Changes:
A few items have been increased in price.
The Penitorium is fully functional.
The Fleet Advisor screen has been completed.
You may choose a specific Aspirant Trial for Neophytes.
Iron Halos no longer suck the life from your marines.
Daemon Binders, Lightning Warriors, and Psyker Abundance advantages added.  Never Forgive disadvantage finished.
More ship names have been added.
Bionics are fully implemented; they are equip in the management screen to restore health to your marines.
The initialization overhaul gave Lamenters terminator armor.  This has been rectified.
Iron Hands have been added to the available chapters.
Integrated Servo Arms' Flamethrowers, underslung weapons, and Jump Packs should now work.
Thunder Hammers are one-handed and require 70EXP to use.
The Master of the Fleet and Master of Recruits are properly integrated as the 4th and 10th company captains.
Lexicanum and Codiciery can be promoted as was intended.  New Lexicanum are assigned powers like they're supposed to.
Master Crafted variants of all weapons may now be seen in Change Equipment and the Shop.
Penitent Chapters can no longer recruit, as was intended.
Space Hulks are now named and Imperial Colonists are no longer sent to them.
If your Disposition or Loyalty is low enough Inquisition Missions become mandatory.
Company Champions have been added.

Other:
The tutorial does not exist yet.  Choosing to enter the tutorial will crash the game.
A few minor screens have yet to be updated, including the Sector Welcome, Post-Battle Fleet, and Company Settings screens.
-----------------------------------------------
0.642

Major Changes:
None.

Other Changes:
Infinite Ruins has been removed.  ANCIENT STARSHIP result should now be completable.
Artifact Terminator/Dreadnought armor should now use the correct amount of space.
Specialist marines should no longer chill at "home" doing nothing.
Teleporting marines bug may have been fixed.  Maybe.
Select all ships for bombard-purging has been fixed.
Fixed initializing dreadnoughts at chapter creation.
-------------------------------------------------
0.641

Other Changes:
With Ancient Ruins, you should no longer be given blank equipment.
Ancient Ruins Artifact crash has been fixed.
Combat should no longer crash randomly.
--------------------------------------------------
0.64

Warning: Old saves are no longer loadable, due to behind-the-scenes array changes.

Major Changes:
Fortress Monasteries have been given additional defenses which are used in Fleet or local Ground battles.  The amount of weapons start relatively low, but increase over time.  This rate is boosted if you have the Crafters or Tech-Brothers Advantage, and the maximum number of weapons is increased by the Siege Masters Advantage.
Chapter Initialization script has been updated.  New chapters start with less Dreadnoughts, and Terminators, but have spare sarcophagi.
Loading/Unloading system has been updated.  Marines should no longer teleport.  Report any bugs this may have generated.
Mechanicus Minor Artifacts, in trade, have been added.
Select All (selection size) has been updated.
The Penitorium has been added (mostly).
Space Hulks have been completed.
Ancient Ruins have been completed.

Other Changes:
Crusades have been given a range indicator for maximum fleet range.
Restored dialogue options to the first Eldar quest.
Removed some debugging stuff that I left in.  Oops.
Perils of the Warp frequency has been halved.
The rare 'Exterminatus across the sector' bug has been fixed.
Star systems should no longer have blank names.
Apothecaries/Techmarines are working again within ships.
Tyranid forces now save correctly.
Various bugfixes.
--------------------------------------------------------
0.636

Major Changes:
None.

Other Changes:
During a battle, if the player/enemy army has only 1 unit remaining their health is displayed.
Equipment changing has been fixed.
Jump Packs no longer take additional space.
Lamenters vehicles are usable once more.
Can now exit from 'I want that artifact' trading.
After exiting from 'I want that artifact', and giving up, marines are returned to their ship.
Exiting out of trading for an artifact no longer messes up the next audience.
The Spyrer =][= mission is completable once again.
Gene-seed can no longer be recovered from asploded or daemon'ified librarians.
The info_fragments crash has been fixed.
Fixed a rare crash with fleet retreat.
Artifact Dreadnoughts can now be equip.  May have generated new bugs- be vigilous.
Various bugfixes.
-------------------------------------------------------------
0.635

Major Changes:
Many new weapons have been added/fixed/included.
Item stats can now be viewed in the armory.
Unidentified STC Fragments can now be traded.

Other Changes:
Control can be returned from Necrons if there is no Awakened Tomb and no Necron Forces.
Control may now be returned to planets by raiding.  Unloading is no longer required.
Requisition income has been doubled.  Certain trade items are now more expensive.
Unloading troops to a Daemon World no longer crashes the game.
Selecting marines with an empty item slot, and other marines with a non-empty item slot, should no longer try to distribute gear.
Sororitas Cathedrals properly slow the increase of heresy.
Can now longer trade fractions of an item.
Artifact weapons have been buffed.
The experience-modifying-stats ceiling has been raised.
Various bugfixes.
--------------------------------------------------------------

0.634

Major Changes:
None

Other Changes:
Founding Chapters get 2000 requisition instead of 500
Recruiting has been fixed.
Damaged ships should no longer kill all marines onboard.
You can no longer unequip Dreadnoughts.
The second problem/quest of each world properly saves now.
Various bugfixes.

--------------------------------------------------------------

0.633

Major Changes:
Daemon Worlds are now functional.
Exterminatus has been added.
Imperial Navy better responds to player Crusades.
Empty Imperial planets will be recolonized.

Other Changes:
Greater Daemons buffed considerably.  Enjoy.
Force Weapons work as intended now.
Several Perils of the Warp results have been fixed.
Control can now be returned from Tau and Chaos planets.
Dreadnoughts can no longer be Apothecaries.  Again.  Goddammit.
Crash when Purge-Bombarding 0 population planets is fixed.
Red Thirst requires more casualties in a battle.
Fixed Inquisition trade bug.
Sister Hospitallers and Techpriests now assist their marine counterparts.
Crusades no longer give Gene-Seed to chapters with the Doomed mutation.
Necron Tombs may now be sealed off with Plasma Bombs.  Might have broken the Necron =][= quest in the process.  Let me know.
Inquisition missions properly save and load.
Salamander and Space Wolf numbers adjusted.