Here is a supposed leak of the final MvC3 roster. While I do not believe it completely, it does seem rather plausible. It could have been just a place holder list or something more, but the way in which it was discovered might lend it some credibility. Personally, iwant it to be true aminly because it has Wesker in it :)
"The full character list for Marvel vs Capcom 3 has seemingly leaked early.
The list emerged via Flash coding on the Japanese Marvel vs Capcom 3 site, though it's since been altered to remove mention of other characters.
In any case, it's an interesting talking point, so here is the supposed character list in full:
Marvel: Spider-Man, Hulk, Wolverine, Mr Fantastic, Captain America, Iron Man, War Machine (alternate Iron Man outfit) Elektra, Thor, X-23, Magneto, Dr Doom, Shuma-Gorath, Emma Frost, Deadpool, Super Skrull, Taskmaster, Juggernaut, She-Hulk
Capcom: Ryu, Mike Haggar, Frank West, Chuck (alternate Frank West outfit), Spencer (Bionic Commando), Dante, Chris, Morrigan, Arthur, Amaterasu , Albert Wesker, Zero, Chun-li, Viewtiful Joe, Trish, Tron Bonne, Hsien-Ko, Akuma, Felicia"
http://www.computerandvideogames.com/article.php?id=252087