Doesn't surprise me that Mago's playing. He hangs out with Tokido who plays everything, he's gonna eventually be interested enough to pick up at least one game he's playing.
As for Poongko, who knows. While yes, SF4 is his main priority, SFxT might take a backseat. Dunno how he feels about the whole 2v2 thing.
Should be the greatest KOF tournament field in history with all of these names in it.