I don't see iOS 7 as a grab-bag of eye-candy features. Having gone to all the UI sessions at WWDC and having used it for a few weeks now, I think what Apple did

I don't see iOS 7 as a grab-bag of eye-candy features. Having gone to all the UI sessions at WWDC and having used it for a few weeks now, I think what Apple did is make a design language / system. It's about how all the pieces work together, not so much what you think of one particular icon or another. It's aimed at a generation of users who already intuitively understand touch interfaces, which will allow developers to innovate new UI concepts that aren't as constrained by faux physical realism. If there's a "killer feature" that other platforms need to worry about, I'd say it's TextKit -- Apple historically excels at typography.