During a podcast interview with Alison Rosen Is Your New Best Friend, Gunn had this to say:
“It’s not really based on anything. The story for Guardians 2 is an original story that I came up with that I started working on actually while I was shooting Guardians 1, and it’ll answer some of the questions that were put forth in the first movie about Peter Quill’s father and who he is and what’s going on with that. We’ll get to know some of the characters a little bit more and then we’re going to meet a couple of new characters who will be very important to Guardians movies and probably important to the Marvel Universe as a whole.” […]I'm sure a few people will worry about him stating that the story isn't really based on anything, and that it's "original" story, but considering how great the first movie was and how different it was from the comics? I'd say there's no real cause for concern. I'm more curious about what character's he'll be bringing in for the sequel. Adam Warlock? Mantis? Moondragon?
Also worth noting? In a separate quote, Gunn mentioned that Marvel thought his plans for the sequel could be considered risky.
“It’s different than what’s in the comic books. Peter Quill’s father is somebody different in the comics. So then when the movie came out, we got green-lit on the sequel right away. I went in and I sat down with those guys and I’m like, ‘Okay, here’s what I think the sequel should be.’ And they were like, ‘Oh, whoa. That’s risky, but okay.’ Now I’m going to turn over the story in a few short weeks and we’ll find out how well it works.”Risky should be a troubling word, but in this case? I'm more than okay with it. The first film was considered risky, and look how that turned out. I want Gunn to keep taking risks with these movies, I think that is what the first movie so great. That they took risks. So yeah, risky may be a curious word here, but I think it is something good in this case.
I don't know what to expect from the sequel, but I'm beyond excited for the movie!
The full podcast will be posted on Monday over on Alison Rosen Is Your New Best Friend (link above).