In fact, there’s already an example of this in the DCU. Batman appearing in Creature Commandos is exactly this. They don’t know who is playing Batman yet, nor what the specific story of his film will be, but they know they are going to make a Batman film. Batman is out there. So that’s why that got a tease.

DC Studios, led by James Gunn, focuses on integrating key plot points into films instead of using post-credits scenes as teasers. Gunn emphasizes granting writers creative freedom and avoiding unresolved cliffhangers to ensure movie quality.