Considering Birds of Prey, Suicide Squad 2, and the Joker/Harley movie have all been discussed, perhaps that’s the trilogy of Harley Quinn movies that was reported. Rather than a traditional threequel arc, this would give the fan favorite character the ability to interact with a variety of DC favorites, and grow from her experiences. And if the three movie arc ends with her final confrontation with Jared Leto’s Joker, it would be a masterful go at serialized storytelling across multiple franchises.
Article source: https://www.cinemablend.com/news/2465419/harley-quinn-rumored-to-be-getting-her-own-dc-trilogy