It was recently reported that The Host star Saoirse Ronan was being used as the model/prototype for Joss Whedon's Scarlet Witch character in The Avengers 2. In a recent interview with The Mary Sue, the actress reveals that she has heard these rumors and that she'd be interested in taking on the role. When asked about it, here's what she said...
I have heard about it and yes, I would. Yeah, of course I would. I love Joss and I love those films, and I love his handle on them and how he portrayed these kinds of superheroes. I think it’s very different from what anyone else has done. So yeah, I’d love to be in it.
Whedon has confirmed that the character will be included in the movie along with Quicksilver explaining that they "sort of represent the part of the world that wouldn’t necessarily agree with The Avengers. So they’re not there to make things easier."
So I guess if Whedon and Marvel end up asking her to be in the film it's safe to say that Ronan will take it. She's a great young actress, and I can see her in the role. She seems like the kind of actress Whedon would cast, so we'll just have to wait and see what happens.