If you haven't yet heard, the first trailer for X-MEN: FIRST CLASS will debut today on the film's Facebook fan page! You'll want to head over there to "like" it so that you'll have access to watch. Not to mention that "a specially designed X-App" full of special features will be unlocked once the trailer is shared enough times. "The X-App gives users the power to evolve their Facebook experience and customize their profile pictures."

But until then, here's a new still from the film revealing the most we've seen thus far of Michael Fassbender as Magneto. Well, the back of him at least. Check it out after the break, along with the film's official synopsis.

X-MEN: FIRST CLASS charts the epic beginning of the X-Men saga, and reveals a secret history of famous global events. Before mutants had revealed themselves to the world, and before Charles Xavier and Erik Lehnsherr took the names Professor X and Magneto, they were two young men discovering their powers for the first time. Not archenemies, they were instead at first the closest of friends, working together with other Mutants (some familiar, some new), to prevent nuclear Armageddon. In the process, a grave rift between them opened, which began the eternal war between Magneto’s Brotherhood and Professor X’s X-Men.

The film stars James McAvoy, Michael Fassbender, Rose Byrne, January Jones, Oliver Platt, and Kevin Bacon. Matthew Vaughn (“Kick-Ass”) directs, and the producers are Lauren Shuler Donner, Simon Kinberg and Bryan Singer. Singer, who helmed the acclaimed blockbusters “X-Men” and “X2,” wrote the story for X-MEN: FIRST CLASS.

Source Entertainment Weekly