20th Century Fox has pushed back the release date for X-Men: Dark Phoenix to Valentine’s Day of 2019 due to some reshoots required. You can read the article below.

Some curious news broke recently regarding two of 20th Century Fox’s upcoming superhero films. X-Men: Dark Phoenix, the next installment in the main X-Men franchise, and the horror-tinged spinoff The New Mutants have both had their release dates delayed, moving Dark Phoenix out of 2018 entirely and pushing New Mutants all the way back to next summer. Dark Phoenix is being pushed out of its initial November 2018 debut to February 14, 2019, so just a couple of months, but New Mutants is being delayed from February 2019 all the way to August 2, 2019. […]
Sources with knowledge of the situation tell us that Dark Phoenix had a test screening to see what was working and what wasn’t, and like most big budget films it needs some additional photography—this is standard procedure for blockbusters nowadays. But given the in-demand nature of this A-list cast, getting all the necessary cast members assembled for reshoots is no easy task. The earliest availability for everyone to return was August or September of this year, which would leave just a couple of months to complete necessary visual effects for the new scenes. That wasn’t enough time, and so Fox decided to push Dark Phoenix’s release date to February to give everyone the time necessary to complete the needed additional photography and post-production on said sequences. So the release date delay for this film is basically just an issue of scheduling.