Silhoutes aren't very clear but to me they look like, from left to right-
Cap, Doom, Deadpool, Wolverine, Gambit
EDIT: Actually maybe that is Thor that is 5th? Looking at his feet that looks like a Hammer.
I would lol so hard if they somehow get Thorcules in this XD
EDIT2: Hmm someone at NeoGAF mentioned that the one next to Cap might be Moon Knight? Dunno TBH, but I'm leaning towards Doom.