Following rumors stating Marvel Studios was cancelling the Inhumans movie over a rift with Marvel TV, now it's learned the Inhumans movie has been pushed back and presently has no release date.
Inhumans was originally supposed to hit July 12, 2019, but now Marvel Studios president and producer Kevin Feige says due to adding Spider-Man, Ant-Man and Wasp and Indiana Jones, that Inhumans gets placed on the back-burner (via Collider).
Since we made our initial phase three announcement, we added Spider-Man, which was a big joyous coup for us. We added Ant-Man and the Wasp, which was a big fun continuation of that story for us. Walt Disney Company has announced an Indiana Jones film for right around that same time. So I think it will shuffle off the current date that it’s on right now. How far down it shuffles, I’m not sure yet.
Feige does offer Inhumans is still happening.
It’s a question of when.
Marvel TV has currently been exploring the world of the Inhumans on Marvel's Agents of SHIELD. With Inhumans looking like a possible 2020 or beyond release date, that may give Marvel Studios enough time to separate their story from the TV version.