When Apple launched Mac OS X Lion last July, it brought the Macintosh operating system ever closer to the experience folks had gotten accustomed to on the iPad and iPhone. Now, just seven months later, Apple today unveils OS X Mountain Lion, an early preview version for developers.

This 9th major release of OS X goes even further in bringing features common to the iPad and iPhone to the Mac. And when Mountain Lion hits, likely this summer, Apple plans to commit to a roughly 12 month release cycle for new versions of OS X.