The hype is building up before WWDC this year about major redesigns for both iOS and OS X (which is unlikely especially since Apple has pulled engineers from OS X to deliver iOS on schedule, and OS X is by far a more complex OS)
We think it’s a cool direction for both iOS 7 and OS X (what cat comes after Mountain Lion? Anybody knows?)
People say “modern, flat designs are all the rage” which is of course true, but looking back they actually always were. They’re just being refined as people understand the technology, hi-dpi screens and touch inputs more and more.