The Guardians filmmaker is currently gearing up for Peacemaker Season 2, which will help expand the DCU. The first movie Superman featured a number of other heroes, but it's unclear what the plan is for Aquaman. While on the Peacemaker podcast, Gunn was asked about about the character formerly played by Jason Momoa, and he said:

The future of Jason Momoa’s Aquaman in the new DCU is still up in the air, according to James Gunn. The DCU is starting fresh, moving away from the old DCEU stories and characters, but Gunn hasn’t decided if Aquaman’s movies will be part of this new world.

Thanks to a new podcast, DC Studios head James Gunn has confirmed Aquaman's canonical DCU status and what it means for current and future projects.