http://www.hollywoodreporter.com/he...y-stupid-love-filmmakers-write-direct-1032210
EDIT - Adding more info from Deadline
http://deadline.com/2017/08/john-re...robbie-harley-quinn-spinoff-movie-1202155227/
EDIT 2 - Deadline has since updated their article to say this about Gotham City Sirens
So Sirens is still a go, apparently.
Glenn Ficarra and John Requa, who direct and executive produce the hit NBC drama This Is Us and who also wrote and helmed Crazy, Stupid, Love are entering the DC cinematic universe at Warner Bros.
The duo are in final negotiations to write and direct an untitled movie project centering on Batman villains Joker and Harley Quinn.
Jared Leto and Margot Robbie are due to reprise their roles as the villains, among the most popular characters in the DC pantheon, and which they first portrayed in 2016's Suicide Squad.
Insiders say that the plan is for this feature to go after the studio makes a sequel to Suicide Squad. The latter is on the development fast-track and out to directors. But the Joker and Harley Quinn movie is also moving fast as the studio has to contend with actors holding agreements, say sources.
The film is described as a ”criminal love story," according to one source, featuring the two murdering maniacs who are cornerstones in the Batman mythos.
EDIT - Adding more info from Deadline
http://deadline.com/2017/08/john-re...robbie-harley-quinn-spinoff-movie-1202155227/
The film has been referred to as Gotham City Sirens, a film that will showcase several top female villains from the DC stable. Suicide Squad director David Ayer was originally attached to direct, but that is changing. Robbie is aboard the project as exec producer.
EDIT 2 - Deadline has since updated their article to say this about Gotham City Sirens
DC has been all over the place with possible movies, and this one is apparently different from Gotham City Sirens, a different Harley Quinn spinoff meant to showcase several top female villains from the DC stable which Suicide Squad director David Ayer is attached to direct.
So Sirens is still a go, apparently.