The movie rights to X-Men are currently owned by Fox instead of Marvel/Disney, so the chances of a crossover with the Avengers are slim to none. However, current X-Men producer Lauren Shuler-Donner is not closing her doors, and has revealed that she’d love to see the mutants appear alongside the Avengers, possibly in cameo appearances or as a future tie-up movie (Avengers vs X-Men: The Movie?)
“I would love it,” she revealed. “I personally have close ties to Marvel because of Kevin Feige. Kevin worked for me. But to take our characters and mingle them in the way that they were written… yeah, absolutely.”
In other Avengers related news, The Daily Mail has recently posted story suggesting that Ms. Marvel may be introduced in Avengers 2, with Emily Blunt and Ruth Wilson being likely candidates for the role. Marvel has declined to comment on the story, neither confirming nor denying the rumor.