Other follow-ups are also possible. Outside of a basic Superman sequel, there could be a Justice League movie, another team-up with Aaron Pierre's Green Lantern, or Superman turning up in future projects, but not as the main focus. The Justice Gang featuring Superman, anyone?

James Gunn’s tease about Superman 2’s release date appears to hint at a possible crossover sequel instead of a traditional follow-up.

"Superman," written and directed by James Gunn, brings Clark Kent and his superhero alter ego back to the silver screen.