1: THE RUNAWAYS
There have been various reports of Runaways being in development for ages. Back in the early days of the MCU, it even got as far as signing a director (Peter Sollet) and had begun casting based on a draft by future Iron Man 3 co-writer Drew Pearce. Feige has said in the past it had been a project Marvel always talked about, maybe this turn of events will change that and finally put the project into traction again.
2: MCU SPIDER-MAN SEQUEL
Part of the storm of news that came from the Sony leak was that Sony was planning to reboot the character in 2017, with a second standalone movie in 2019. Though that was pre-Marvel deal, Kevin Feige even mentioned in a recent interview that Spider-Man's acquisition could be a reason for Inhumans to be moved, so that may be the very reason why he was moved now.
3: DOCTOR STRANGE SEQUEL
This is another likely candidate for 2019. A reasonable period of time after the first film, and if the film follows Marvel's history of financial success, a sequel would be very likely to be greenlit, making this a likely possibility for Inhuman's old release slot.
4: THE FANTASTIC FOUR
Hey, a guy can dream, right?
So what do you think? Do you think any of these options are possible, or do you think something not on this list might be a potential replacement? Leave your thoughts in the comments below!