xD
Mavericks is 10.9. I'm calling it now. They're going to spend 2 years developing the next version and they'll call it Mac OS 11. Or XI if roman numerals are still cool.
Mac OS 11 is going to be revolutionary and contain something insane that we could never live without. Secondly it'll have the feature tag line of 'The Gaming OS'.
It'll blow all competition out of the water. Just like what the iPhone did to dumb phones.