SCEA's markets boss, John Koller, has said that the brilliantly titles Massive Action Game will be an iteration of Socom when talking to VG247 at GDC last week. He also mentioned that it is a '256 online-player game which is spectacular.' Pretty words. He also said this;

“If you look at that competitively, it’s something that’s only possible on PS3. The processor speed, the ability of PS3 to showcase 256 players at any given time, and their actions.”

I'm not sure how trustworthy he is, though, since he's the marketing boss of SCEA and it's his job to say this kind of thing, but, you know, 256 players.