Last night, shortly after the Spider-Man coming to Marvel announcement, it was announced that 4 films would be getting new release dates in the MCU, including the film that was originally opening up the same day at the next Spider-Man film:
Marvel’s “Thor: Ragnarok” will hit theaters November 3, 2017. The following year, Marvel’s “Black Panther” will make its way to theaters on July 6, 2018, and Marvel’s “Captain Marvel” on November 2, 2018. Finally, Marvel’s “Inhumans” will now debut in theaters July 12, 2019.
Both Mavel's Avengers: Infinity War Part one and Part 2 will hit theaters on May 4th 2018 and May 3rd, 2019. Their release dates are unchanged.
This will obviously give a little more breathing room to these films, especially Thor: Ragnarok which is getting pushed back a few months from summer to fall.