Okay, looks like there’s quite a bit more being added, this is courtesy of Icy-Veins:
Maw Introduction Skippable
Players who have completed the introduction in the Maw on one character will be able to speak to Highlord Darion Mograine in the capital cities to skip it on their alternative characters on their account.
Allied Race Unlocks
Allied races such as the Kul’Tiran humans, Mechagnomes, and Dark Iron Dwarves, which had a dungeon requirement to unlock them, will no longer need to complete the associated quest to gain access to these races. Players will be able to skip it instead.
Additional Travel Points in The Maw
Players will be able to take advantage of additional fast travel options from Ve’nari’s Refuge to Perdition Hold and Desmotaeron within the Maw by unlocking access to them.
Remote Anima Turn-Ins
Completing quests from Archivist Roh-Suir will provide access to an Anima Diverter within Korthia where Anima can be directly deposited.
Alt Leveling Improvements
A variety of improvements will be introduced in support of a smoother experience leveling alternate characters through Shadowlands, such as an additional rank of Heirloom upgrades, and improvements to Threads of Fate such as the addition of Torghast as an option and Renown gains for completing bonus objectives.
Drop rates for Runecarving recipes will be increased to 100% drop rate in any dungeon difficulty.
Battle for Azeroth Legacy Loot Rules
Legacy loot rules will be enabled for players at level 60 in all Battle for Azeroth raids and dungeons, causing encounters to drop the number of items as they would randomly drop for a 5-player dungeon party or a 20-player raid.