20th Century Fox has moved the dates for three of its upcoming X-Men films after Gore Verbinski (Pirates 1,2 &3) exited as director of the Gambit film starring Channing Tatum. That film moved from February 14, 2019 to June 7, 2019.
In addition Deadpool 2 moves from June 1, 2018 to May 18, 2018, while The New Mutants will now be released February 22, 2019 instead of April 13, 2018.
It should be noted that now The New Mutants may be released when the studio is under Disney ownership, depending on when the deal closes.