And, speaking recently, DC producer Peter Safran confirmed that Gunn will wrap filming on The Suicide Squad before he moves back to Marvel.
He told JoBlo: "Everybody knows on both sides that Suicide Squad  is the priority today and he'll finish that movie and then everybody knows that his next film will be Guardians ."
Safran also confirmed that Suicide Squad 2 will be "a total reboot" and not just a sequel - which makes sense, given the lacklustre reviews of the first movie.
(Although the 2016 David Ayer film did win an Oscar. Yes, really.)
"First of all, we don't call it Suicide Squad 2 cos it's a total reboot," Safran added.
"So, it's The Suicide Squad and I think people should be extremely excited about it.
"It's everything you would hope from a James Gunn script and I think that says a lot and that promises a lot and I know that we will deliver a lot."
The news comes after reports that Will Smith probably won't be returning to The Suicide Squad as Deadshot.
The Suicide Squad is out in cinemas on August 6, 2021.
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