Around 30
Personally, I'm hopin' for more. I hope that the 30 count is a 'what we have currently in our heads'. If they could push for about 40, then I'd be a damn happy camper, since MvC2 had 56 characters, and taking out various clones, there was at least 50 different playing styles, and while having 70+ would be awesome, I'm not stupid enough to not take in system limitations. 40 different styles and graphical models would be awesome, and there's enough characters on both sides to add in, and Capcom knows it. Also, best. subtitle. ever.
Fate of
Two
Worlds
Let's hope that MvC3 is actually a prototype name for the actual title...Tatsunoko VS Marvel VS Capcom. Show of hands, who wants to see Cyclops, Ryu, and Tekkaman Blade beat-down Iron Man, Chun Li, and Polymar?