According to a new rumor, DC Films and Warner Bros, won't be starting production until at least 2018, in order to accommodate the busy schedule of franchise star Will Smith. However, Suicide Squad 2 isn't the only planned entry into DC's extended universe. Margot Robbie's Harley Quinn is set to take the spotlight in the Suicide Squad female-centric spinoff, Gotham City Sirens which is now listed as "in development.