James McAvoy starred in what just might be the best super hero movie of the year with X-Men: First Class, briefly spoke on what he thought the sequel should see regarding his character, Charles Xavier (Professor X).
McAvoy notes that the end of the first film saw his character utterly devasted in that he lost both his best friends and his ability to walk; he says that just can't be swept aside.
He can't just become the guy that we saw in the first three movies. He just had two major things happen to him. He's lost his best friend, essentially, and he's just been paralyzed from the waist down. Which is just a huge, huge blow to his considerable ego. So he's got to deal with that.
And I don't think we can just brush over that and go, "yeah I'm in a wheelchair now," because Professor X is in a wheelchair. You've got to deal with that, I don't care if he's a superhero and has brain powers or not, he's just had a huge part of his physical life taken away from him, by someone he cares about more than anyone else. So he's got to deal with that. That's part of the interesting ideas that we're talking about with Matthew [Vaughn], that Matthew's very excited about which I think is fantastic, but I can't really get into them with you because they may (or may not) form the spine of the story.
McAvoy also mentions that he is signed on for a three movie deal if Fox choose to do them.
I would definitely like to be in the sequel, but the truth as well that I'm bound to be in the sequel by a contract that says we do three films.