Marvel Studios may not have announced an official release date yet, but there's no doubt that a third Guardians of the Galaxy installment will be made. There’s also no doubt that James Gunn, who directed the first two movies, will direct. According to the director, the third movie will probably head into production during the latter half of 2018.
Gunn, who’s already started penning the script, recently told Collider that cameras are expected to roll for Guardians of the Galaxy Vol. 3 in "a little more than year". Asked about a release date, he said that he knew "when the basic time" was.
The director appeared to suggest in May that the third movie would hit the theaters in 2020, and Marvel has scheduled three untitled movies for release on May 1, August 7, and November 6. A late-2018 start in production could indicate that the movie will take the first of those dates.
During the interview, Gunn said that they’re going with the title Guardians of the Galaxy Vol. 3 for the moment, but he added that it could change in the future. As for the story, he called it the third act of his trilogy, and promised answers:
The truth is, the first movie is the first act, the second movie is the second act, and the third movie is the third act, so I'll tie a lot of stuff together in the third film. We’ll get a lot of answers on a lot of different things, so doing that in an elegant way takes a little bit of grace and elegance. It's more challenging in that respect, writing the third movie than the second movie.