Fantastic Four Vs. The X-Men Movie In The Works?

Is Twenty-First Century Fox working on a Fantastic Four Vs. the X-Men movie? Simply Superheroes sent us a news tip pointing to a news report from The Motley Fool from yesterday which claims that Twenty-First Century Fox is planning to "combine the Fantastic Four and the X-Men for an 'Avengers'-style movie." Earlier this year, Fox creative consultant Mark Millar did indicate that the Fantastic Four and the X-Men existed in the same movie universe. However, he later clarified his comments by Twitter. Millar wrote, "I keep seeing 'news' that X-Men & FF movies are crossing over. No, they're not. They exist in same universe but movies stand alone." At first, we thought Motley Fool might have just seen the Mark Millar comments about Fantastic Four and the X-Men existing in the same universe, but not have seen his subsequent denial of a crossover. However, the Motley Fool's report goes beyond even Millar's first comments and indicates some specific details about the crossover. Not only does the report indicate that Fox will be combining the two franchises, but the crossover movie will reportedly  be based on the 1987 four issue mini-series called Fantastic Four vs. the X-Men. Instead of teaming up and working together, the characters will reportedly be pitted against each other because of secrets regarding the Fantastic Four's origin. The Motley Fool doesn't note when the movie will be released, but they do make reference to the Fantastic Four reboot, which has been announced for a June 19, 2015 release date. It's a little unclear if Motley Fool is suggesting that the Fantastic Four reboot will actually be Fantastic Four Vs. the X-Men or if the Fantastic Four Vs. the X-Men movie is something that will come at a later date. So does the Motley Fool have some inside scoop on an as of yet unannounced Fantastic Four Vs. the X-Men movie?