According to the blue post:
Players who reach max Renown for their Covenant will be able to freely switch among any of the four Covenants without cooldown or restriction
I haven’t even reached max Renown yet, welp.
New Character Customizations
A variety of new character customizations are being introduced for Nightborne and Lightforged Draenei along with additional updates to ear size options for void elves, new travel forms for druids, and new Soulshapes for Night Fae.
Yes.
Introducing Legion Timewalking
Delve back into Legion Dungeons with Legion Timewalking […]
Maw Introduction Skippable
Players who have completed the introduction in the Maw on one character will be able to […]
Island Expeditions: Queue Solo or with a Party
Players who want to take on Island Expeditions are now able to […]
Yes.
Talent and Ability Improvements
In 9.1.5 we are working on additional updates to a variety of class talents and class abilities including Conduits, Runecarving, and Covenant class ability tuning.
I hope for incremental changes, not the type of “rebalance” that forces the majority of players to reroll.
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 […]
Additional Travel Points in The Maw
Players will be able to take advantage of additional fast travel options […]
Remote Anima Turn-Ins
Completing quests from Archivist Roh-Suir will provide access to an Anima Diverter within Korthia […]
Yes.
Transmogrification Linking
Show off your complete transmog outfit to chat […]
I hope not. This is already supported by addons. Official support of this could causing unnecessary controversies. WoW players come from vastly different geographical regions and culture backgrounds, and have very different views on what is fashionable and what is bawdy.
Currently, only players with certain addons can see complete transmog linking. Official support will make everyone able to see the links. This could enable new types of trolling and controversies.
Alt Leveling Improvements
[…] 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.
Yes.
PvP Gear Power Adjustments
Lower item-level PvP gear will now scale to a higher item-level in PvP situations than before. This should reduce the power level gap so that new characters can feel that they’re able to compete in Battlegrounds and Arenas more readily. This change will not affect high item-level PvP gear.
What happened to faction balance? Has the Alliance been forgotten?
I think all low ilevel gear should scale up, not just PvP ones. A new player freshly completed the Shadowlands campaign at ~110 ilevel should not be the opposition faction’s easy prey.
Runecarving Recipes
Drop rates for Runecarving recipes will be increased to 100% […]
Battle for Azeroth Legacy Loot Rules
Legacy loot rules will be enabled for players at level 60 […]
Yes.
There are also numerous undocumented changes coming with 9.1.5. I hope we don’t see a sharp increase in chat censorship, emote censorship, transmog censorship, guild and pug censorship, etc.