Casting for Bryan Singer and Director Matthew Vaughn's X-Men: First Class is well underway and it's very clear that they, along with Fox, are doing their best to give the franchise a fresh start with an entirely new set of actors.
So far, we already know James McAvoy will be playing the younger version of Patrick Stewart's Professor Charles Xavier and the latest rumors have the talented Michael Fassbender possibly joining the cast as Eric Lensherr/Magneto. Reports also indicate that they're testing and searching for actors to take over the key roles of Cyclops and Jean Grey, confirming that no one familiar to the franchise will be playing the characters in First Class.
Adding to the possible talent behind the latest X-Men project, Forces of Geek are reporting that Rosamund Pike (Die Another Day, Surrogates) is testing for the part of Emma Frost in the series prequel.
While we do not yet know who will comprise the X-Men: First Class roster, it's been pretty certain all along that Emma Frost would play a key role. Her character was of strong interest to Bryan Singer back when he was still set to direct X-Men 3 and she ended up being introduced when played by Tahyna Tozzi in X-Men Origins: Wolverine.
My only confusion about the possibility of this casting choice is that Pike, who was apparently spotted with Emma Frost comics in hand, is 31 years old. As we know, X-Men: First Class acts as the prequel to the X-Men trilogy and follows a younger (teenage?) version of the first students at Professor Xavier's School for the Gifted. As we saw in the continuity-crippling X-Men Origins: Wolverine, the character of Emma Frost was depicted as a youngster at the same approximate age as Cyclops and the other young mutants rescued by Professor X at the end of the movie.
If they choose a 31-year-old to play Emma and a late-teen or early-twenty-something to play Cyclops, that may not work if they're planning on playing up the relationship between Scott Summers and Emma (love triangle, anyone?).
If Pike is picked up for role, I'd expect the movie would be playing into the earlier storylines of the character from the books where she may be more of a villainous character or perhaps she could take on a teaching role for Xavier or for herself in her own Mutant school/training program (that was played up in the Ultimate X-Men storyline).