Yesterday, we reported that Suicide Squad director David Ayer will be tackling a new DC project entitled Gotham City Sirens, which reunites him with Margot Robbie, reprising her role as Harley Quinn. This project has been in the works for a few months, with Margot Robbie herself taking this film to the studio, with the initial report claiming that other DC female characters like Batgirl and Birds of Prey will be featured. Today we have confirmation of two more female DC villains that will be joining Harley Quinn, thanks to director David Ayer.

The filmmaker took to Twitter earlier today to reveal a piece of artwork that features Harley Quinn alongside iconic DC villains Selina Kyle, a.k.a. Catwoman and Ivy Pepper, a.k.a. Poison Ivy. Both of those characters were mentioned in yesterday's report, but this image from the director himself seems to cement their involvement in the movie. We'll likely have to wait quite some time to find out who will play these characters, and it remains to be seen whether or not initially-rumored characters Batgirl and the Birds of Prey will be included in this story. Yesterday's report also revealed that a new writer has come aboard, so perhaps a different approach is being crafted.

Christina Hodson, who was part of the Transformers writers room who is currently writing the Bumblebee spin-off, came aboard to write the script in November. Oddly enough, yesterday's report revealed that another female writer from that same writers room, Geneva Robertson-Dworet, who is also writing the Tomb Raider reboot and Sherlock Holmes 3, has now come aboard to write Gotham City Sirens. Our very first report on the movie revealed that Margot Robbie was working with an unidentified writer before she took the project to Warner Bros., but it was never revealed who that writer was.

Related: Gotham City Sirens Is Still Happening, But No One Knows When

Yesterday's report also revealed that this movie, which Margot Robbie is also executive producing, is farther along in development than Suicide Squad 2 and the studio's proposed Deadshot spinoff, which would bring back Will Smith as this DC villain. DC Films' Geoff Johns will produce Gotham City Sirens along with Jon Berg. No specific plot details have been released at this time, but, now that the title Gotham City Sirens has been revealed, it is believed to be based on the comic book of the same name.

The Gotham City Sirens comic book was created by Paul Dini, launching its first issue in June 2009, as part of the DC Comics' Batman relaunch. The comic featured all three of these villainous females, Harley Quinn, Catwoman and Poison Ivy, working together as one group. The comic series was canceled in 2011, to make way for the New 52 reboot, which was relaunched by writer Judd Winnick. It's also worth noting that, earlier this month, Vikings star Katheryn Winnick expressed her interest in playing Black Canary, but it hasn't been confirmed if that character will be featured in this movie. While we wait for more on Gotham City Sirens, take a look at David Ayer's tweet below, which confirms Harley Quinn, Catwoman and Poison Ivy.