The Disney-Fox deal is about to close within the next few months, and with it are going to be some casualties in the Fox superhero slate. Previously the studio announced movies based on Gambit, X-Force, Doctor Doom, Silver Surfer, and Kitty Pryde. It looks like none of those will make it out as none will be in production by the time the merger completes.
According to Daniel Richtman on Twitter, the Fox projects not currently in production are dead. Dark Phoenix will be released as the final X-Men movie, and New Mutants will be the final Fox Mutant movie period.
Not a huge surprise but from what I hear Gambit and Dr. Doom are officially dead.
As for X-Force, it's not "Officially" dead, but they only have two months to start filming it and that's not gonna happen. So… not happening, not with Fox anyway.
— Daniel Richtman (@DanielRPK) January 11, 2019
Deadpool co-creator Rob Liefeld seemingly confirmed the X-Force cancellation news:
Marvel Studios expects to be able to begin developing Mutant and Fantastic Four characters within the next six months.