I think Apple App Dev's are about to find out that IOS 7 breaks all their stuff. All iPhone/iPad/iPod apps will need to be updated. A lot of those apps will not be updated, and I bet a lot of people will buy their next, "iWhatever," and it will be their last, "iWhatever."
I do not see how Apple can go, "metrophonual," without totally hacking up the code.
As far as plugins go.. I really like, "flat, functional, cool." Oxium is a good example of that.
Rapture has been this since 2007? July 07? Whenever it came out. Rapture was the GUI that really broke this barrier. May not have been, "the first," definitely one of.. Certainly the most famous.