A Hollywood Reporter story claimed that Wyatt felt micro-managed by executives at Fox, and chose to depart the film rather than stick with something he didn't necessarily see eye-to-eye with them on.
That's four months after its previous release date of Valentine's Day 2019, presumably enough time for the studio to find another director.
Essentially, it will be trading places with another of Fox's "X-Men" films, "The New Mutants", which had been scheduled for June 7, 2019, but which will now land February 22, 2019.
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Disney already owns the vast majority of Marvel Films properties, but long-standing contracts give Fox the rights to the "X-Men" and "Fantastic Four" properties.
According to Deadline, director Gore Verbinski (A Cure for Wellness) has left the director's chair of Gambit due to "scheduling issues", and the site claims the split was amicable all around. "We had a first draft". If Tatum had bailed as well then the movie itself might be in jeopardy - and no one wants that.
All jokes aside, the decision for him to direct probably meant that the Gambit film was going to be a bit of a swashbuckling adventure with a significant bit of humor (like many of Verbinski's other projects), so this could be a significant loss to the project. Tatum, a MS native whose father is from Metairie, boarded the project in May of that year. Hailing from New Orleans, Gambit is perhaps best known for manipulating playing cards.
A mutant superhero who has the ability to transfer energy into solid objects, making them potentially explosive weapons, Gambit has a backstory involving a guild of thieves in New Orleans, where is was part of the Cajun community before moving to Westchester County and Xavier's School.