is it me or does the UI not get AA'd anymore?
 

On live I notice that borders on frames will blur depending on whats behind it in the game world.

On beta borders stay sharp all the time. Or maybe I'm losing my mind :)

Was going to suggest the opposite. I have not played for a few builds, but I immediately noticed that player models in the UI had antialiasing applied to them, compared to live where models has no antialiasing. So I'm guessing they're doing something.