Take a look at this:
http://fusionfall.com/index.html Appears to be a CN massively multiplayer deal, as filtered through the infamous Bleedman comics. It's open for beta testing if you're a gamer. Foster's is included. The gallery includes an outside shot of the mansion, and the video page is framed by a picture of Mac with a frighteningly normal head. A wall-eyed Bloo can be briefly seen early in the video itself.
I'm not sure this is a good idea. It's all creepy looking when the CN characters show up. Not all the shows mesh well, either; how do you combine the Eds' cul-de-sac with the Kids Next Door?
I've never played one of these, so I don't know if it's different than other games like this. I don't expect it will be mind-blowing, based on the last big game. Awesome House Party is glacially slow in progress and some minigames are flat out impossible. I may be wrong, but I don't think this will be any good.