We reported earlier this month that Matthew Vaughn was finally set to direct Fox's latest mutant film and now it seems the casting is starting to come together, with one big role being filled. Heat Vision Blog is reporting that James McAvoy will star in X-Men: First Class as Professor Xavier. Here's an excerpt from the site's article which explains more of the story.

"According to Fox, First Class will, "chart the epic beginning of the X-Men saga. Before Charles Xavier and Erik Lensherr took the names Professor X and Magneto, they were two young men discovering their powers for the first time. Before they were archenemies, they were the closest of friends, working together, with other Mutants (some familiar, some new), to stop the greatest threat the world has ever known. In the process, a rift between them opened, which began the eternal war between Magneto's Brotherhood and Professor X's X-Men."
RELATED: Tom Hardy Joins the MCU's X-Men in '80s-Era Wolverine Fan-Art

The film is being fast-tracked for a summer filming start in London with a June 3, 2011 release already set.