Okay I played a little with the ken, and everything I'm say'n is only to help so sorry if I offend anybody:
Con: Okay for starters the shield isn't there in the beginning so it just pops out of nowhere which is kinda weird, his A.I. is alright its just a little strange how he does some moves that are unnecessary at times, and the shield doesn't show up in the light punch, or any of the kicks. his second blasting attack in mid-air (the electric one) where he shoots directly down I think would be more useful maybe diagonal or something.
Pro: The moves are all awesome! there isn't one thing I saw about that ken that wasn't awesome (besides the minor defects) I think it would be even cooler(and easier) if his uppercut, the one that heads straight up, had the shield on top of his fist pointing up ward.
Questions: will there be any special intros with Ryu or Captain America?