GENERAL
Added power cooldown indicators as a WIP option, accessible through Options > Window > Beta Settings.
Fixed a couple of issues with the Cathedral of Pain that could cause it to get stuck if all the Obelisks were destroyed or the Aspect of Rularuu was defeated right when the Willforges respawned.
Replaced the Jetpack Suppliers in the Shadow Shard with P2W Field Agents.
Some unused Pandora's Box SSA contacts were being introduced by other contacts; this should no longer happen.
Fixed a server crash when a player in the final stage of character creation disconnected from the queue server during an unusually long SQL wait queue.
Fixed a client crash when putting an enhancement in the Auction House (OuroDev PR #66 & #70).
Fixed a client crash seen during activities with many active power effects, such as the Rikti mothership and Hamidon raids, by switching to 64-bit FX/Sequencer handles.
Fixed a client crash in the UI drawing code if a pet has a creator but no owner.
Connections from the client to the QueueServer were not encrypted; they now are. In addition, encryption keys have been upgraded from 512 to 4096 bits.
BASE EDITOR
"Apply to Room" and "Apply to Base" will now work to fill an entire block floor-to-ceiling.
Added an experimental option to use outdoor lighting in supergroup bases. It is recommended you try it with different skies to find one suitable for your base style. Outdoor lighting disables the dynamic lighting used in base rooms and from base items; there's (at the moment) no way to have both.
Replaced the "Exit" buttons with an "Options" menu with options for Default Sky, Lighting Type, Grid Size, Angle Snap, Room Clipping and Hidden Markers. The hotkeys and slash commands still work, this is just for ease of discovery of the new features.
Yes, new items are coming, they just weren't ready for this patch.

GRAPHICS
Offloaded all the hardware-only physics effects to the CPU. This results in the same physics quality as enabling PhysX hardware, as has been requested, without having to actually update the PhysX libraries. The reason it's being done this way is because updating the libraries would break the game client for other servers that share the same game files. The impact on the CPU is negligible on modern hardware.
Modified the Glacier FX so it can be looked at from below.
Improved particle effects for Burst Of Speed power in Blaster/Martial Manipulation secondary.
Improved the Ki Push FX from Martial Combat.
Lowered the saturation of the reflection cubemap used in the tailor, to better display colors while in the costume creator.
General improvements to many chest emblems, chest details and supergroup emblems: cleaned edges, reduced compression, standardized resolution.
Added a second color on many chest and shield emblems that previously only took a single color.
Repairs/improvements to Face textures to help with skin tone matching and reduction of uncanny valley. The Medusa face was missing the entire blue channel in its diffuse map, this has been reconstructed based on clues in the other parts of this face.
Improvements to the Makeup color masks for female heads; mostly blurs the edges of the lipstick so it blends better and fits onto the lips more fully when the player chooses heads with different shaped features.
Fixed a glitch with the Buckled Leather top and alpha channels on chest emblems.

POWERS
Immobilize Powers in Controller and Dominator primary power sets should no longer make their targets immune to KnockUp. KnockBack will be converted to KnockDown. This helps sets like Ice and Earth, as their AOE Immobilize power will no longer make their AOE Knockback power useless.
Cold Domination for Controllers and Masterminds now have a Minimal FX option, just as Defenders and Corruptors do.
Archery animations should now work properly.  No more floor kick animation when trying to fire an Acid Arrow, among other things.
Rain of Arrows animation has been reduced from 4 to 2 seconds. Base recharge time has been increased 5 seconds to compensate.
Bio Armor > Hard Carapace: This power should now offer damage resistance in PvP.
Stalker's Ice Melee should now crit on PvP.
Flash Freeze should now affect flying enemies.
Glacier should now be usable while flying.
Fixed an error that allowed players to create Shield Defense characters with Claws, Dual Blades, Ninja Sword, Spines or Staff Fighting primaries. These characters always were broken and unplayable.
Scrapper's Shinobi-Iri should now be able to accept Jump enhancement sets.
Sentinel's Beam Rifle > Refractor Beam should now accept Defense Debuff sets.
Doppelgangers from players with the following powersets will no longer spawn without any powers:
Blaster Support > Ninja Training
Blaster Support > Plant Manipulation
Blaster Support > Radiation Manipulation
Brute Defense > Radiation Armor
Brute Melee > Radiation Melee
Dominator Assault > Radioactive Assault
Mastermind Buff > Cold Domination
Scrapper Defense > Radiation Armor
Scrapper Melee > Radiation Melee
Sentinel Defense > Bio Organic Armor
Sentinel Defense > Radiation Armor
Sentinel Defense > Super Reflexes
Sentinel Ranged > Beam Rifle
Sentinel Ranged > Water Blast
Stalker Defense > Radiation Armor
Stalker Melee > Radiation Melee
Stalker Melee > Staff Fighting
Tanker Defense > Radiation Armor
Tanker Melee > Radiation Melee
Tanker Melee > Spines

REWARDS
Patrol XP can now be consumed in Architect Rewards mode and/or with a bonus XP multiplier. It will always add 50% to the base XP earned.
The conversion rate from Vanguard Merits to Reward Merits has been increased from 10:1 to 30:1. The intent of the conversion rate is for a Mothership raid to award between 30 and 50 Reward Merits, with Hamidon rewarding 80 Reward Merits as it requires a lot more setup and coordination. The initial ratio of 10:1 was set on a small server, and it is entirely too good for the kind of population that Homecoming supports.
Rikti War Zone pylons now drop 3 Vanguard Merits when destroyed, for a total of 60 Vanguard Merits for all 20 pylons.
Rikti Drop Ships and Patrol Ships now drop 6 Reward Merits and 10 Vanguard Merits when destroyed.
Fixed an issue with Morality Missions not resetting the mission owner's alignment points on completion in some cases. This does not apply to teammates, only the mission owner.
Increased the reward for completing a Morality Mission to 40 Reward Merits. Originally this was lowered from 50 to 20 based on datamined times it took to receive a new Morality Mission after completing one, but that time was skewed by the above bug allowing players to run Morality Missions back to back.
The reward table at the end of the Statesman Miss Liberty Task Force and Lord Recluse Task Force stated that the Synthetic Hamidon could be picked once every 24 hours, and if you had ran the Task Force before the 24 hours were up it granted a Single Origin enhancement instead. However, the timer on the reward table itself was 18 hours, leaving a window of 6 hours in which you thought you would get a SHO, but got a SO instead. This has been fixed by lowering the 24-hour check to 18 hours.
Death From Below will now gradually grant less Experience Points after level 10. The effect is based on the experience points required for each level, so it has a built-in curve that starts with a very minor decrease and ramps up until level 20. Please see GM Jimmy's post below for more details on this change. Jimmy nerfs.