Eh. OS X has been on somewhat of a tick-tock update cycle since Leopard. Add features then refine them.
Also, it's twenty bucks.
Also, it's twenty bucks.
The direction appears to be cheap upgrades, and merging feature sets between IOS and OSX so eventually there's one operating system that changes in unison.
It is believed by some that Apple will not be pushing their operating systems in this direction:
http://daringfireball.net/2012/02/mountain_lion
Specifically: "Mountain Lion is not a step towards a single OS that powers both the Mac and iPad, but rather another in a series of steps toward defining a set of shared concepts, styles, and principles between two fundamentally distinct OSes."
My point was whether there had been a movement of developers to a new iOS/OSX based project e.g. like an AppleTV. Because it seems that iOS6 and Mountain Lion combined seem to lack the combined punch of previous releases.
I think they have gone quite carefully on iCloud.
Beyond that, actual UI enhancements are minimal.
It's more iClouding Apps. Or App improvements. Less to do with the OS itself.