This game is gonna be for ps3 & xbox 360. It is suppose to be released sometime next year.
As you could tell from the title, this is the 3rd (5th) game in the Marvel VS Capcom seires (8th in the VS Capcom seires.) There have been 6 characters confirmed so far.
They are:
MarvelHulk (The Incredible Hulk)
Iron Man (Iron Man (Doi!))
Wolverine (X-Men)
Deadpool
Captian America
CapcomChris Redfield (Resident Evil 5)
Morrigan Aensland (DarkStalkers)
Ryu (Street Fighter)
Dante (Devil May Cry)
Felicia (DarkStalkers)
We won't be seeing Tyrant or Nemesis from Resident Evil because it could change the game's content rating.
We won't be seeing any of the Fantastic Four neither because they don't have the rights to it.
A bunch of this was found on wiki.
-EDIT-
I will probably update the chars lists when more chars are revealed