Personally I don't like the 'bubblegum' of the iOS7 previews I have seen so far. I'm sure my daughter will love it but as a William Gibson loving tech nut it leaves me feeling a little left out in the cold... Be that as it may, this is what I wanted to say to you: people seem to think of jeweled buttons and gradients as skeumorphism but I find that to be something of a narrow view.
Example: my favorite skeumorph in OSX - type in an incorrect password at the lock screen and the little thing 'shakes it head' as if to say: "uh-uh, try again" such a light touch and so playful and benign at just that moment that the user is feeling a tad aggravated. How much better is that than a giant red 'X' an an ominous warning gong?
Skeumorphism in today's design circles is pretty much the definition of the phrase: don't throw out the baby with the bath water.