OS X 10.10, the next version of OS X which carries the code name of "Syrah", will take a few cues from iOS 7 with a somewhat flatter look compared to OS X Mavericks



From MacRumors:

The report comes on the heels of comments from Apple executives reiterating that convergence of iOS and OS X is a "non-goal" for the company.Instead [of a complete iOS 7-like overhaul], I am expecting OS X 10.10 to have user-interface tweaks that will make the interface ?flatter,? but not as stark as iOS 7?s look. I?d also expect some blur and translucency effects in a few places, but not in anyway that is central to the experience like it is on iOS. There will be a little bit more white space, more defined menu bars, and squared-off window controls, but I would not expect a full color palette change and redesigns for every single application and icon.

  OS X 10.10 to Feature 'Flatter' Look, but Not as Stark as iOS 7