Matthew Vaughn out of X-Men: First Class sequel

With no explanation at this moment it has been announced that Matthew Vaughn has left the director's chair for X-Men: Days of Future Past, the sequel to X-Men: First Class. Despite his departure the cast is still intact, including Jennifer Lawrence and Michael Fassbender, and they are still aiming for the July 2014 release. There are replacements being thrown around already and the one at the top