Changes Synopsis:
ACP and TCP is removed.
You level up after every adventure (and can stop leveling up)
You gain gold per hour
You earn DT after every level
You gain renown magic items and benefits according to tier
Characters created at S9 have benefits
New replacement for faction charity
New uses for DM Rewards

Character Conversion:
All ACP is removed, you also have the option to advance one level if you wish.
TCP is removed
Existing characters keep the gold they have. Future earnings are gained using the Season 9 rules.
You keep the magic items you have but are subject to Magic Item Limit found in the Season 9 ALPG.
If you have more magic items than the current tier limit, select which item(s) the character retains (to a maximum of your Magic Item Limit). All other items are held in reserve and you can choose one magic item from the reserved list when going up a tier; all other magic items not chosen are permanently removed.
If you possess fewer magic items than the current tier limit, receive a number of permanent magic items unlocked (except for the evergreen or seasonal unlocks) until you reach your limit.
Legendary items can only be kept by tier 4 characters. If you are T1-T2, you place your legendary items in "reserve" until you reach T4.
You can receive any (or all) legendary items kept this way when you reach T4. Finding a legendary item at T1-T3 unlocks it as normal and does not count against your magic item limit.

DM Rewards from S8:
ACP is removed and you earn one DM Reward for every 8 ACP (rounded down) you have.
These DM Rewards can be exchanged for advancement and other rewards for your characters.
Rewards earned from CCC adventures can only be exchanged for advancement
TCP is removed
Magic items unlocked through DM Quests can be given to your characters as you choose.

Leveling up:
You automatically gain a level after an adventure. In Hardcovers, the DM can tell when you level up; otherwise, you level up after 4 hours of play at T1 or 8 hours at T2-T4 (think of it like ACP).
You have the option to decline gaining a level.

Gaining magic items:
Whenever your group finds a magic item, each character can choose to keep it and get a copy of it. The number of magic items you can own at one time is determined by a limit per tier.
Common magic items do not count against your limit.
You must choose to replace or add the item after the session. If not, the item is discarded permanently (no more unlocking). This does not apply to legendary items found in T1-T3.

Gaining gold:
You gain gold equal to the hours you play in game. According to your dungeon master, you can gain either the maximum or minimum gold per hour.
You have a maximum amount of gold you can earn per level. If you reach this maximum, you can't earn any more gold until you level up. At level 20, this limit resets after every adventure completed.
Any treasure with a monetary value (gp, gems, art objects, etc.) mentioned is ignored. (ALDMG p.4)

Gaining DT:
Your character earns 10 downtime days after gaining a level (20 for tier 2 – 4 characters).

Renown:
You receive different benefits per tier. These benefits are not exclusive to faction members
Tier 2 characters and above gain access to: +1 weapon, +1 shield, +1 rod of the pact keeper, or a +1 wand of the war mage; Your character’s Magic Item Limit applies to this item, and the item can’t be sold or traded.
You can lose access to renown benefits by being suspended (Long-term and short term suspension; ALPG p.5)

Faction membership:
Faction membership is optional and you can join one by having the Safe Haven background feature (you can leave, join, or change factions at any time by replacing the background feature.
Tier 2 faction members gain access to a specific item tied to their faction. This is lost if you leave the faction. a. Your character’s Magic Item Limit applies to this item and it can’t be sold or traded.

Season 9 Character Creation (ALPG p.6):
Lingering Legacy of Evil: More benefits to a Soul Coin such as advantage on temp hp and using it for two questions.
If your character is not an aasimar or tiefling, they gain a common magic item from XGtE with restrictions
Plane-Touched Wings: Aasimars and tieflings get this benefit regardless of PHB+1.
Aasimars at 5th level, can permanently replace the Light Bringer trait and racial trait they gain at 3rd level to sprout feathered wings—gaining a fly speed of 30 ft.
Tieflings at 5th level, can permanently replace their Infernal Legacy trait with the Winged tiefling variant trait. This is only applicable to PHB Tieflings (Not Feral Tieflings or MToF Tieflings).

Dungeon Masters Rewards:
“DM Rewards" are now a resource. You earn one DM Reward for each module or CCC you run. You also earn one DM Reward for every 4 hours in an HC. You may expend it in the following ways (ALDMG p.2):
CCC DM Rewards can only be used for Leveling up
One of your characters gains a level plus an amount of gold based on their tier prior to advancement
You gain a magic item rewarded in the adventure. If the character to which this reward is applied is of a lower Tier, see ALDMG
Campaign Rewards. See the list in ALDMG pp. 3-4
Only DM Rewards earned through the current season HC or modules (Forgotten Realsm: Avernus Rising or Eberron: Oracle of War) can be used for "Campaign Rewards"
You may only place a reward on a character from the campaign for which the reward is designated.

Faction Charity:
You can either pay for the services with gold or by trading a magic item.
These can even raise dead characters that can only be regained through true resurrection or wish.
Trading a magic item temporarily reduces their Magic Item Limit by 1. This reduction persists until the character reaches the next tier of play (or, for 20th-level characters, until they’ve completed two adventures). You can do this option even if you have no magic items

Trade:
Trading magic items is on a one-for-one basis and must be of the same rarity (no longer same table)

Other resources:
S9 Condensed:
https://www.dndbeyond.com/.../44505-season-9-upcoming...

Character Conversion + DM Quests:
http://dndadventurersleague.org/season-9-character.../

ALPG and ALDMG for Season 9:
http://dndadventurersleague.org/season-9-campaign.../