Update, 10/30: Bryan Singer is officially on board as director of 2014's X-Men: Days of Future Past, according to Deadline.
The outline reports that Singer, who directed the first two films in the X-Men franchise, "has just closed his deal to return." Matthew Vaughn, who directed 2011's X-Men: First Class and was originally attached to the film, will likely sign on as a producer.
Fox still hopes that despite the director switch, the film will make its July 18, 2014 release date.
Original story: Matthew Vaughn won't be directing X-Men: Days of Future Past, Deadline reports, and that could mean the directorial return of Bryan Singer to the franchise.
Singer, who directed 2000's X-Men and 2003's X2: X-Men United, is at the top of Fox's list of potential directors, according to the outlet. He also produced and worked on the treatment of 2011's X-Men: First Class, directed by Vaughn, and is already on board as a producer of Days of Future Past.
Not much is known at this point about why Vaughn chose not to helm the sequel, though Deadline reports that the Kick-Ass director's next movie might be another adaptation of a Mark Millar comic — Secret Service.
X-Men: Days of Future Past is currently scheduled for July 18, 2014, with James McAvoy, Michael Fassbender and Jennifer Lawrence all set to return.
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