Mac OS X 10.8 operated machines suggests that Apple employees are already using an early build of the next gen of Mac OS X. Lion was officially announced in October 2010, and was later released in July, 2011 to the app store.
Calculations based on Apple`s release schedule would indicate an official release for OS X 10.8 in mid-to-late 2013. We`re still not clear as to the features of this new OS X version. However, we have been reading about 3D gestures to control your iOS devices from a distance. So, probably we`re going to have to wait for a public release or a leaked rumor, whichever comes first.