In addition to the Suicide Squad sequel, Gotham City Sirens movie, and the Harley/Joker film, Margot Robbie is also developing a separate solo Harley Quinn film. During an interview with MTV’s Josh Horowitz, the actor revealed that she’s been developing the film for some time.  

“Yeah, I’ve been working on it for two years now. I mean, it’s hard to kind of talk about it, because all the stuff is kind of under lock and key. But I’ve been working on a separate spinoff Harley thing for a while now,” she said. 

“I want to see her with other women, Robbie continued. “I kept saying when we were shooting Suicide Squad, I was like ‘She needs her girlfriends.’ She needs other girls around her, because she loves that. You see that in the comics, she loves meeting people, any people. But she needs a little girl gang.

Although Harley is set to join Poison Ivy and Catwoman for the adaptation of Gotham City Sirens, Robbie confirmed that the project is “a totally separate one... there’s a lot going on right now. I’m not sure anyone knows what’s going to be the next thing, but everyone is itching to get Harley back on screen.