Speculation continues to swirl on which actors will be joining Matthew Vaughn's X-Men: First Class.  Today, Production Weekly [via The Playlist] reports that 20th Century Fox has expressed strong interest in casting Amber Heard (Pineapple Express) and Rosamund Pike (An Education) for the roles of Mystique and Moira MacTaggert, respectively.  Pike was previously rumored to play Emma Frost, but it now looks like she'll be playing MacTaggert.  It makes sense for that character to be in the mix since in the comics she's a confidant/love interest of Professor Charles Xavier.  Xavier is the only role that's been officially cast with James McAvoy (Wanted) playing the telepathic chrome dome.

Hit the jump for more on what we know about the project so far.

Aaron Johnson (Kick-Ass) is reportedly "locked" into the film, presumably for the role of Cyclops.  It would be interesting to see if he got this role and Peter Parker in the upcoming Spider-Man reboot.  Speaking of Spider-Man and X-Men, Michael Fassbender (Inglourious Basterds) is reportedly choosing between the two projects.  According to sources, he's under consideration for playing Magneto in First Class and an unnamed villain in Spider-Man.  The release dates for First Class and Spider-Man are over a year apart (June 3, 2011 and July 3, 2012, respectively), but Fassbender has a pretty full schedule as he's set to appear in Jane Eyre, Steven Soderbergh's Knockout, David Cronenberg's A Dangerous Method (formerly The Talking Cure) and potentially the thrillers Woman in Black and Tinker, Tailor, Soldier, Spy).  He'll next be seen this Friday in Jonah Hex and in August in Centurion.

Jane Goldman (Kick-Ass) is currently handling the script, which is based on a story by Bryan Singer.  Singer's plot revolves around the creation of the Charles Xavier's School for the Gifted and the fracturing of the professor's friendship with Magneto over the relationship between mutants and humans.