As of now, the Harley Quinn character is tentatively scheduled to appear in Suicide Squad 2, a Joker-Harley Quinn movie and an all-female villain film, Gotham City Sirens.
Suicide Squad actress Margot Robbie has revealed when she will return to the role of Harley Quinn, but still can’t say which of the planned movies featuring her character will next bring her back to the screen.
Just prior to the announcement of a Joker and Harley Quinn movie being in the works, Warner Bros. revealed that it’s also working on a Joker origin story film that would not include Harley Quinn and would also not bring back Jared Leto as the Joker.
Plus, Robbie is rumored to be on Quentin Tarantino’s radar to play Sharon Tate in his mysterious Charles Manson project.