Board Thread:Movies/@comment-3048593-20170411234907/@comment-3048593-20170507184446

In terms of sequels to MCU-films, some have been two years apart from each other (Iron Man and Iron Man 2, Thor and Thor: The Dark World, and Captain America: The Winter Soldierand Captain America: Civil War), and so far only one pair has had 4 years apart from them, which was Thor: The Dark World and the upcoming Thor: Ragnarok. So I wouldn't be surprised if Marvel Studios would decide to shoot it up to 2021, just to give some breathing room after Avengers 4, which will also have the Guardians of the Galaxy-characters in it.

But assuming GotG Vol. 3 does end up in 2020, along with a Doctor Strange sequel (which I think is likely), for the later year slot I could see them giving it to a sequel to Black Panther. While that may be just a 2 year gap between the two, the first one will come out early 2018, in February. Though of course that is assuming it will do well enough (financially and critically, which personally I hope it does), for it to warrant a sequel to it.