Okay so far I’ve caught:
Rogues get Cunning Strike. The name suggests a BA attack, to me, or a BA feature that makes an attack better.
Rogues, Rangers, Monks, maybe Paladins (I don’t recall) are getting weapon mastery. Plus side is obvious, downside is potentially even less uniqueness to the fighter unless they really dial up the special mastery features for fighters stuff.
Shadow Monks are in the playtest, and reference the Shadowfell. Smart.
Multiple new subclasses will be tested.
A new spell, and revised spells.
No Epic Boon Feat as a “class feature”, but they still want to do something with them.
— I think they should give one at levels 13, 15, 17, and 19, with some chains in there so you can really dial in an epic theme, but I doubt they’ll do that.