Apparently there's something going on PS Home today. The Playstation Blog says it's some sort of Alternate Reality Game (ARG). The two biggest ARGs that come to my mind were the two associated with the releases of Halo 2 and Halo 3. I Love Bees (Halo 2) was absolutely incredible... I'm only sad that I didn't discover it until well after the fact. However, the audio clips associated with it (found here) played out a really good story. The Halo 3 ARG was fun to watch unfold, but ultimately didn't do much for me. I'm about to hop onto Home right now and see what this one is all about.
UPDATE: Now that I've checked it out it looks like they've at least put a story together for the whole thing. I'm not sure if this is going to be some kind of game release announcement or some new things in home. It sounds like you're assisting some group called AFK who (in the ARG at least) assisted in the creation of home. The team leader was apparently working on a side project called Xi. It looks like there will be periodic updates with new tasks that unlock new pieces of the puzzle. There's some kind of emblem you're collecting pieces of... however when you scroll over them you can see a shadow of the piece I assume will be there. I wouldn't be surprised if somebody puts together a composite of the thing early. If this is some kind of new Scion I'm going to be pissed.
Comic: Comet Inducing
44 minutes ago