I'm perfectly content with the features my iPad currently has, but I think that a significant UI overhaul is needed, as it seems that the general interest in iOS devices is starting to wane...
This is a rather interesting concept:
It's significantly different, yet not so different that it seems alienating. I'd probably miss the home screen dock found in older iOS versions, though.
So, what would you like to see from iOS 7? New features and modifications welcome.