So no X-Men. I'm okay with that considering it is an Avengers game but I wonder if they will join the game down the road considering a lot of them have also been Avengers (Beast, Rogue, Storm, Cannonball, Wolverine, etc)
Edit: Frenzy is a mutant but she might be a villain in the game.
Honestly, I'd rather them keep X-Men out of this. It's been a while since X-Men have really been featured in a game (UA3 is the only one they've been in recently) since Marvel was on a mission to make the franchise unpopular enough that Fox would sell the rights. Which now is no longer an issue... But, if they keep X-Men out of this, it will make the eventual X-Men game they show up in feel more exciting.