From Batman News:
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Earlier this month, Margot Robbie said that she was working on a new Harley Quinn movie that wasn’t Gotham City Sirens. And with Gotham City Sirens not promoted at Comic-Cons this year like other DC movies, fans have wondered if the movie was still happening.
Collider caught up with director David Ayer, and when asked what the status on Gotham City Sirens was he simply replied “it’s in development”.