It looks like FOX is going to go the Marvel route and combine their mutant properties into their own cinematic universe! As you know, they are currently developing new Fantastic Four and X-Force movies, and it looks like both of those will exist in the same movie universe.
While talking to SFX, comic writer and Marvel Fox movie consultant Mark Millar had this to say when asked about Fantastic Four,
"Without question I think you have to see some of these guys showing up in each other's movies. I think the most exciting thing in superhero movies, until The Avengers came along, was when Nick Fury showed up in 'Iron Man.' Even though it was a guy with an eye patch it was really cool—and I expect we will see more of that."
Then in a separate interview with Den of Geek, Kick-Ass 2 director Jeff Wadlow was asked about X-Force and it's place in the X-Men universe, and this was his reply...
"Oooh, let's see, what can I say? Let me put it like this. It will seamlessly exist in the X-Men cinematic universe, but it's not a sequel."
So there it is! Fox is building up their own cinematic Marvel universe. Hopefully they can pull it off successfully. I'd love to see a shared universe with all of these mutant characters. There's a lot of potential there and it could be really cool. I just wish the studios could work together on combining forces so that they could crossover into each other's movies.