I don't know about the environment, taking that out would be a major deal breaker for a number of users, it's the one thing that Logic has that nobody else does. Personally I'd like to see it stay since novice users don't ever need to see it anyway, but be supplemented by things like midi plugins for arpeggiators and other functions like that.
And I don't think EXS is really that relevant any more. At this point most developers have gone to Kontakt or other sampling engines, and I don't think it's likely many would come back to a plugin that only runs on one app and one OS.
Definitely improved pitch and time and probably new instruments, plugins, and content. But I'd be most excited about making the whole thing more efficient and stable and adding the right features.