UPDATE: Fox has responded to the report that Fantastic Four’s rights are returning to Marvel – it’s “completely untrue.” Marvel has issued a denial as well.
Marvel has reportedly worked out a deal with FOX for the Fantastic Four movie rights, according to Den of Geeks. Marvel gave FOX the TV rights to the X-Men in exchange for the film rights to the Fantastic Four with plans for a 2020 film. Marvel currently has three untitled films slated for 2020.
ComicBook.com adds that the rights to Silver Surfer, Galactus and Dr. Doom were included in the deal.
There has been no official announcement by Marvel or FOX. At this time, I would consider this a hot rumor till a second source comes forward.