Wait, what? Yep, we're just as confused as you are, but Gabe Newell himself announced Portal 2 heading to PS3 with some form of Steam Cloud support in-tow. Weirder? He claims the "best version" will arrive on Sony's console. We've got about a million questions to ask and we'll be putting them to Valve this week, so keep an eye out.
Oh, and also, there's a really fantastic trailer that we'll be grabbing for you as soon as possible. Sorry about the tease, but we felt you should know.
Update: Valve has sent along a press release confirming Steamworks integration in the PS3 version -- the only console version featuring that functionality, actually -- providing the game with "auto updates, community features, downloadable content, and more."