Today, the potential magic of AirPlay is a little cramped in practice. Video apps don't push out video, and Macs don't push out anything, except through iTunes. A purported Jobsmail says that'll change next year.
Even if the Jobsmail isn't 100 per cent authentical, if AirPlay is Apple's grand plan for your living room, it's a pretty sure bet that it'll connect more Apple products more tightly in the future. Like multiple applications on the Mac from Safari to QuickTime X (hello Lion), and third-party video apps. The less safe bet is that it'll work for pushing games from your iOS device to your TV, but we'd like to see it anyway. [MacRumors]