If you are still feeling overwhelmed with today’s news of OS X Mountain Lion Preview and the first public beta of Messages for the Mac, do not be: Apple just published a nice video demonstration of key new features on the new OS X Mountain Lion Sneak Peek page. It will take some time before the clip goes live on Apple’s official YouTube channel. Until then, enjoy the above Newsit Tech’s conversion of the Mountain Lion showcase that is likely to be pulled soon.