The situation is suspicious, but we may have caught Rockstar red handed.
RDR2.com writes about how a film crew was recording in Montana state in the United States, and their producer, Jeff Guillot has answered a few questions. While he did not mention any names, he did drop a few hints, though.
Two actors in Wild West attire? A 20th-century church as part of the location? Shooting for a video game? Shooting for an already existing, global franchise? You can put the pieces of the puzzle together and figure it out that Rockstar might be behind the project altogether.
They may already be focusing on E3, where we might see the live action trailer in its full glory.