MCU: Predicting Every Marvel Movie From 2020 - 2022
9. May 1, 2020 - Guardians Of The Galaxy Vol. 3
The one movie we know is 100% coming at some point in 2020, James Gunn has already been confirmed as the writer and director for the trilogy-capper.
Given Guardians 2 was released in the same slot, and that in a post-Avengers 4 world this will be one of the MCU's biggest, most marketable sub-franchises (which it is now anyway, let alone in a world potentially without Cap, Iron Man, and Thor), then it seems nailed on for the major spring release date, which has previously played home to all the Avengers movies and Captain America: Civil War.
It will be the end for the Guardians as we know them though, with Gunn saying it'd bring to a conclusion this iteration of the team. However, he also said it'll set up the next 10-20 years of Marvel movies and, with the director heading up the cosmic branch of the MCU, there'll be a lot more to come from him.
Somewhere down the line we'll probably see a Rocket & Groot spin-off, maybe a Ravagers movie, and you'd think he'd be the one to bring someone like Silver Surfer into the MCU.