The screen has way too much going on at once. It's hard to look at. Apple always make visually pleasing UIs; so it's hard to say that they would crowd there screens with so much data. I'm sure they will polish the UI (ex. in the volume of Leopard's UI from Tiger).
I think they will just significantly improve notifications (and how they are dealt with). Also, they may add up/down swipes on the home screens to access 'Dashboard' or something of that nature.
I don't expect anything super dramatic like everyone is proposing. Apple never dramatically changes their UI (just like at Mac OS X; small changes in each release). Here's the thing too - the UI is solid. If it ain't broken, don't try to fix it. Seems like people get bored too quickly these days.