This is the one part of the upgrade i don't understand. It wasn't shown off at WWDC this year or any builds of mountain lion released prior (correct me if im wrong on that last part) and like a day or two later, Apple updated that website to show that facebook integration would be a part of mountain lion...in the fall. I would imagine the update for this will drop around the same time iOS 6 launches but still, its a very strange way of announcing this feature