If you thought Fox was slowing down on movies based on Marvel Comics properties, the 2018 slate, featuring New Mutants on April 13, 2018; Deadpool 2 on June 1, 2018; and X-Men: Dark Phoenix on November 2, 2018, probably put that thought to bed. If even that plan didn't show you their dedication to the franchise, well, this should: 20th Century Fox has reserved release dates for 2019, 2020 and spring 2021, marking six Marvel movie releases in just 21 months.
New Fox/Marvel movies will hit theaters on June 7, 2019; November 22, 2019; March 13, 2020; June 26 2020; October 2, 2020; and March 5, 2021. The production house has not indicated at all whether those will be X-Men or Fantastic Four films, the two properties they currently own film rights to from Marvel Entertainment. This is a common practice in the blockbuster release category nowadays; Marvel Studios has three untitled films on schedule for 2020 as well (in May, August and November, so no direct overlap), and all of DC's 2018, 2019 and 2020 film dates are still technically occupied by untitled films. DC notably has April and July dates in 2020, meaning if all these films go forward with their current releases, we'll have a superhero movie in March, April, May, June, July, August, October and November of that year. Yowza.
All three films in 2018 are X-Men-related; this year's Logan was their only release in the category — and in 2016 Deadpool and X-Men: Apocalypse were it — that will make six X-Men movies in a row, after the box-office and critical disaster that was Fantastic Four in 2015.
So what could be coming? Well, one of those dates is almost certainly for X-Force. The R-rated superteam film has been in the works for years, with at least two versions of a script written and a rumored team line-up that includes characters like Domino and Cable, both of whom will be introduced in Deadpool 2. This could be either a stealth Deadpool 3 or simply Fox's Avengers moment. X-23, also rumored for X-Force, could easily get a film of her own. After the breakout performance by Dafne Keen in Logan, even James Mangold said he'd love another chance at directing her and her feral character.
Standard sequels for Deadpool, X-Men and even the New Mutants franchise could all slide into one of those six slots, as well, as could the Gambit movie that at this point is in about the sixth layer of development hell. (Remember when that movie was coming out last October? Yeah, we barely do either.)
As for the Fantastic Four, well, there's a rumored animated film, though it probably wouldn't hold one of these particular dates. A third live-action reboot from Fox seems increasingly unlikely, though, especially if they're able to successfully have essentially three X-Men franchises all running simultaneously with the R-rated-verse, the X-Men core team and the New Mutants team. There are rumored to be as many as 2,000 named characters in the Fox/Marvel licensing agreement, so it's also possible they have something from far left field to throw into the mix.
For now, we know there are more coming from Fox and Marvel, and hopefully they'll be great.