Why do I say "apparently" he's the android superhero in Avengers: Age of Ultron?
Well, because the source everyone is using is the sometimes-dubious Daily Mail, which has this to say:
"Make-up experts were using various powders and potions on Bettany's pale skin to bring about the Vision's chalk-white complexion."
Now, I may not be up on every version of the Vision, but when was he "chalk-white"? And why, after seeing The Da Vinci Code, would anyone need to test and see if Bettany's face can be made white?
Bettany has been seen around the studios so I'm sure he's involved in some way. But I would wait until another source confirms before being 100% certain that this is his role. If it is, I like the choice.