Everywhere I look, Fox is still saying that they are NOT giving up the rights to the FF. However, almost a year ago Sony was saying that there was never going to be a Spider-Man in the MCU, and then we all wake up one cold morning in February 2015 to the announcement: "Spidey Joins the MCU!" and "Sony and Marvel work together on Spider-Man!" So, I will just remain cautiously optimistic. Now, to the topic at hand---Establishing Marvel's "First Family" and their good buddy Victor von Doom into a continuity that is already rolling along may sound difficult to some, but I think that IF this pans out, Marvel will do it well. I say this because they (in my opinion) did a really good job of establishing Hank Pym and Janet Van Dyne into the continuity in a manner that made sense. We all know that the FF are constantly engaging in some form of time travel and interdimensional travel, so I think that they're going to establish that Reed, Sue, Ben, Johnny and Victor (and maybe even H.E.R.B.I.E. - LOL!) have been lost (assumed permanently lost in the MCU) since the 1980s. I think that they'll be able to retroactively establish a relationship with the Pyms and the FF, and I think that this will be a great opportunity to bring Michael Douglas back as Hank Pym in an effort to find the FF and bring his friends back from wherever they've been "lost" for the last 30-35 years. This will also explain away why the FF and Doom aren't candidates for a nursing home in the current MCU, because their time travel debacle will mean that they haven't aged the way that they would in the "real world." Just an idea of mine. Probably a bad idea, but I like it.