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New Mutants has been pushed off of its April 13 release date and completely out of 2018. It is now scheduled to be released on February 22, 2019. The initial reported reason behind the 10-month delay was to avoid overlapping international release windows with Deadpool 2, which moved up two weeks to May 18, 2018. As you might have guessed, there is more to it than that.
From Marvel Studios News: