Sightings: From Left to Right
Capcom: I think that I saw: Viewtiful Joe, then Ryu, then some long haired woman I don't recognize (who kind of reminds me of Zero Suit Samus), then Chun-Li, and then Dante from Devil May Cry.
Marvel: Captain America, then someone in body armor (possibly Apocalypse, can't be Iron Man, it's too broad and the helmet is shaped all wrong, unless they are using one of his Argo models) or in a heavy cape, someone with a sword (Deadpool, but his hair looks more like Blade's upon closer inspection), Wolverine (I think, could be a Skrull, judging by the pointy ears), and someone with crazy hair at the end, whose form is too crazy for me to accurately guess at.
Anyways, I'd love to see Deadpool and Captain Marvel, and maybe Megaman.exe (they did just do Volnutt), and also some Young Avenger/Runaways action would be nice. But no Sentry, he's too overpowered, and no Green Goblin, he's too mentally deranged. Iron Fist would be cool.
And Phoenix Wright and Matt Murdock should have a lawyer-off.
Oh, and Doctor Strange all the way!
EDIT: It is completely possible that the last person on the Marvel side is the original Hawkeye (Clint Barton), since the "crazy hair" looks more like a hand reaching over his right (your left) shoulder, and it looks the the tip of a bow is peeking over his left (your right) shoulder, and I think I saw a hint of the Hawkeye mask in there as well. Still just a guess, though.
