Fox has moved Bryan Singer from the directors chair to producer for the upcoming X-Men:First Class. They are doing this because they want to move ahead with the project right away. Singer will not be available to direct because he will be busy with Jack the Giant Killer.
It seems the studio liked Jamie Moss' script for X-Men:First Class so much that they want the movie to be the first of a trilogy. They would also like to have it out soon, possibly by 2011.
Singer will join the production team of Lauren Shuler Donner and Simon Kinberg. Casting will begin soon and it is likely that it will be shot in 3-D or converted later.
Fox has already talked to several directors for the project.