But isn't Marvel trying to push forward their new Marvel canon? I think they might want Buckycap.
While Marvel will likely have plenty of say in the roster on their side, and likely will push their canon to some degree, there are still some things to consider.
As always is the case, the Marvel vs. Capcom games, as well as the characters and plotlines that may exist, are something unto themselves. Not only in respect to what fans will be expecting from the series, but in light of how the games can afford to take some liberties, because Marvel can't expect people who just want to play this damn game to keep up with their canon from the last decade, and may be more likely to know of Marvel's heroes through the movies and "Super Hero Squad". Much less people like me who did more to drop off years ago, and only pop in occasionally for good TPB material like Cable/Deadpool and Planet/WW Hulk.
So, I'm thinking? Canon-pushing will likely get some nods, but will be minimalized for the sake of that casual Marvel crowd I posed above. I mean, it may be obvious that certain characters like Carnage and others may not get in (because, well...they're kinda dead, and some haven't been relevant in over a decade any way). But if came down to it, if ANY version of Venom were to get into the game, it would likely be something closer to the familiar, "WE WILL EAT YOUR BRAIN~!" Brock-Venom that people know and love the most (and still gets marketed through Super Hero Squad-inspired toylines and the like).
At best, comic book geeks will get their nods likely through the form of some newer characters introduced in the last few years, and characters possibly getting "skins" that reflect recent developments in the story line (Anti Venom and Red Hulk are easy examples of this, I think). But Marvel does have to remember that, again, this game isn't explicitly for comic book geeks, just as much as Capcom has made it clear that this game isn't merely for fans of previous Marvel-style fighters.