When Disney bought Fox, Marvel head Kevin Feige was saying don't expect the X-Men or any other Fox entities to join the MCU for, at least, a handful of years after the deal is done.
He stated the characters weren't under Marvel's control yet so until the deal goes through and that happens he's not planning anything.
However, the deal has gone through and Feige's boss over at Disney Bob Iger, speaking to [THR], is saying Feige is ready to oversee the X-Men, Fantastic 4, and Deadpool.
"I think it only makes sense [that Feige takes over]. I want to be careful here because of what's been communicated to the Fox folks, but I think they know. It only makes sense for Marvel to be supervised by one entity. There shouldn't be two Marvels."
On If Deadpool could become an Avenger:
"Kevin's got a lot of ideas. I'm not suggesting that's one of them. But who knows?"