Here's the article

Comic book guru Mark Millar has revealed that the planned Fantastic Four movie reboot will occupy the same cinematic universe as the current X-Men movies.

The author of Kick-Ass, who works as a creative consultant for 20th Century Fox, told SFXthat fans could expect to see the Four share the screen with characters from the X-Men films.

"Without question I think you have to see some of these guys showing up in each other's movies," he declared.

"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."

And he admitted that the previous Fantastic Four movie was "not very good", but is convinced he has the secret to success for the reboot.

"For the new one, all they have to do is make it great. It sounds obvious and it is," he explained.

"Sam Raimi gave us a great Spider-Man. Christopher Nolan gave us a great Batman. So a brilliant director is probably the most important thing for a great Fantastic Four.

"Tim Story was seen as an odd choice for Fantastic Four, but when you have a Josh Trank you know you are in safe hands."

Trank, who is helming the new Fantastic Four, is reported to be targeting a 2015 release.

So I guess that makes them able to do Franklin Richards as he is a mutant,

So what are your thoughts, what would be your ideal crossover movie.

(Source http://www.mtv.co.uk/news/fantastic-four/388798-fantastic-four-reboot-x-men-universe)