I'm hoping the fact that Disney is letting Fox attach the trailer to TFA is part of a deal to bring FF back to Marvel. If the rights do revert back, it probably won't happen until the beginning of the year because Fox will probably want to wait until after DVD/digital release. Interestingly Peyton Reed was also talking about FF in an interview, and how the tone has to be done right. Although he's on Ant Man and Wasp right now, Marvel probably wouldn't schedule an FF movie until 2020 at the earliest. So conceivably he could take it on, and also start setting them up for inclusion in the Marvel U with cameos or short scenes in IW 1&2 before leading up their own movie. That would be a great way to introduce the team anyway. It would be so cool to finally see 8' Hulk and 7' 6" Thing sharing the screen.