Samuel L. Jackson and Cobie Smulders were spotted Sunday on the Atlanta set of a Marvel Studios film, but there's some disagreement about which project it might be. Is it confirmation that Nick Fury and Maria Hill are in Avengers 4, or has Captain Marvel started production a little earlier than expected? Perhaps it's for something else entirely.RELATED: Brie Larson Visits Air Force Base For Captain Marvel ResearchThe photos surfaced on Just Jared, with no indication of which project they're film. An earlier rumor suggested that Captain Marvel could shoot for a week this month before beginning principal photography in March. Although there are no Marvel features filming at the moment, the studio has three in various stages of post-production: Avengers: Infinity War, Ant-Man and the Wasp, and the still-untitled Avengers 4. It's possible Jackson and Smulders were shooting a post-credits scene for one of those three films, or possibly a minor pick-up.

Jackson's Fury sports his facial scar and eye patch in the photos, which would seem to indicate this isn't for the 1990s-set Captain Marvel, photographer Atlanta Filming offered some other details on Twitter. For starters, the scene isn't meant to be set in New York City, as all of the vehicles have Georgia license plates. However, Captain Marvel co-director Ryan Fleck may have been spotted on location.

Now, that doesn't necessarily support rumors that Marvel plans to shoot some Captain Marvel scenes this month. Fleck could have easily supervised a post-credits scene, as the Russo brothers are in Park City, Utah, for Slamdance after wrapping Avengers 4. Of course, the other option is that Fury and Hill are indeed in Avengers: Infinity War despite previous reports and are simply doing pickup shots for the film ahead of its May release.