Gunn spoke with Collider recently and discussed the upcoming Gaurdians of the Galaxy 3.
He had this to say
It’s been pretty easy,” Gunn said of the scripting process. “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’m tying a lot of stuff together in the third film. We 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. I do an incredibly in-depth treatment for every movie. I think of writing a screenplay as creating the body of a human being and you’ve got to start with the skeleton, start with the bones, and you create the bones. You take a lot of time because that’s the actual base of the movie and if you screw that part up, later on down the line, you’re going to have a lot of mistakes. So by creating a really strong foundation for the story, that’s the most important thing. So I write a good treatment that’s probably about 70 pages long. It includes photographs and things like that. So that has been the way I’ve dealt with every movie and this one as well.”
Guardians of the Galaxy Volume 2 was one of the best films Marvel has done, ever, so I for one cannot wait for part 3