It's a thrill to know what superhero movies are planned through the next five or six years, but one unfortunate side effect when we're that far away from release is that the dates are always subject to change.
This is likely the case for Marvel's Inhumans, which has already been pushed back on the schedule once before, from 2018 to 2019. In an interview with Collider, Marvel Studios head honcho Kevin Feige revealed that Inhumans will likely be slipping once more, due to the new additions to the studio's film slate:
"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 did assuage fears that Inhumans was going to be canceled altogether — following rumors that Marvel felt the storyline was already done justice on Agents of S.H.I.E.L.D. — saying that the movie happening was just "a question of when."
As it stands, Inhumans is scheduled for release July 12, 2019, a few months after the release of the epic "finale" Avengers: Infinity War - Part II, but that probably won't be the case for long.