When Marvel and Sony announced the new Spider-Man movie for July 28, 2017…the god of thunder had to move. As that was originally the release date for Thor: Ragnarok, four of Marvel’s Phase 3 movies had to shift:
Thor: Ragnarok moves from July 28, 2017 to November 3, 2017.
Black Panther moves from November 3, 2017 to July 6, 2018.
Captain Marvel moves from July 6, 2018 to November 2, 2018.
Inhumans moves from November 6, 2018 to July 12, 2019.
The release dates for Avengers: Infinity War 1 and 2 were not affected by this, and these moves mean that Inhumans will now open after the second part of the Thanos war and will thus be the final movie of Phase 3.