According to a reports, Disney and Fox are closing the deal that would bring the X-Men, Fantastic Four and related characters into the MCU. The terms are mainly agreed and it will be officially reported next week.
Regaining the rights to the live-action rights to the X-Men was a fundamental piece of the deal with only the rights to the Avatar films rivaling their importance. Deadline’s report indicates that Marvel Studios head honcho Kevin Feige is very eager to begin incorporating Marvel’s mutant heroes and villains into the post-Infinity War MCU. Fox already has an impressive slate of X-films scheduled for 2018 and beyond.
This means things like Avengers versus X-men could be brought to the movies.
Secret Wars the movies could happen.