They've backflipped on almost all their egregious design choices.
Almost everything every level headed person has been saying is wrong with the game is getting fixed in Shadowlands. It's almost like Ion and his legion of fanboys were wrong the whole time.
Let loot be loot.
Vendors and currencies back for PvP.
No titanforging or shitty RNG system of any kind.
Un-pruning classes.
Craftable legendaries.
Making professions matter again.
Less loot will drop making loot more meaningful - no more vendoring thousands of epics every expansion.
Potential return of class themed sets.
World of Warcraft: Shadowlands. ("Please stop leaving our game, you were right.")
I mean there is still some shit things like we don't know much about Anima Power(AP) and the Covenant abilities can NEVER be balanced(Blizzard is dogshit at balancing).
At this point though it turns out the Blizz Defenders were wrong. It's too early to celebrate but from a pessimist at least they're saying all the right things. Ion is a pathological liar though so only time will tell.