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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.

Gunn said he's bringing key lessons in franchise building from his time at Marvel to DC Studios, with a strong focus on script quality over release dates and building a connected universe that still allows for standalone stories.