Updated November 6, 2017 at 4:42 p.m.: Bloomberg is reporting that talks between 21st Century Fox and the Walt Disney Company over an acquisition of part of the former's TV and movie holdings has ceased. CNBC's original report referred to the talks as "on again, off again," saying they could resume talks in the future.
This unconfirmed talk of a partial buyout however seemingly stoked the stock market however, with Fox shares rising 8.9% and Disney 2.4%.
Original Story: 21st Century Fox is in talks to sell the bulk of its media assets to Disney, according to CNBC. The sale would reportedly include Fox Entertainment Group, the portion of the company which owns 20th Century Fox (and with it the rights to many films including the X-Men and Fantastic Four franchises).
Should the purported negotiations lead to a sale, the business trade reports that 21st Century Fox would retain ownership of the Fox networks which Disney legally could not own since it already owns ABC, the Fox Sports networks which are a direct competitor to Disney's ESPN, and Fox News.
The obvious implication, should the sale take place, would be that Disney would then own or control nearly all of Marvel's extant film rights, allowing them to potentially bring the X-Men and Fantastic Four franchises into the Marvel Cinematic Universe in the same way they incorporated Spider-Man - though they would own the rights outright, rather than sharing or licensing them, as with Sony's Spider-Man rights.
20th Century Fox has multiple X-Men related films currently in development and production, with New Mutants, Deadpool 2, and X-Men: Dark Phoenix all scheduled for release in 2018 alone. A film centered on Fantastic Four villain Doctor Doom is also in the works from Legion showrunner Noah Hawley.
Marvel Studios president Kevin Feige said in June of this year that there were no plans to pursue the Fantastic Four as part of the Marvel Cinematic Universe. It is unclear if the reported negotiations for the sale would have already been underway at that time.
Back in 2001, Disney acquired Fox Family Worldwide from 21st Century Fox for $2.9 billion (plus $2.3b in debt assumption). Through that deal, Disney received what would later be named Disney XD and Freeform.