I went to look if this still existed after the DCEU slate reveal, especially since a lot of people were asking, and apparently the answer is yes.
Source: http://m.ign.com/articles/2017/07/2...making-gotham-city-sirens-instead-of-a-sequelWhen we asked Ayer why he chose to tell this story, as opposed to a direct sequel to Suicide Squad, he responded, "It's a story about three fantastic women who're trying to find their way in the world, and realize that they have more power together than they do individually." He added, "I have daughters, and I want to create something that might be able to help them get along in the world a little bit."
The Gotham City Sirens comic, written by Batman: The Animated Series' creator Paul Dini, follows the trio of Harley Quinn, Catwoman, and Poison Ivy, and their adventures around Gotham City. We pressed him on whether Harley Quinn, who will once again be played by Margot Robbie, will switch up her iconic look. Ever the professional, Ayer replied, "Let's put a pin in that. Maybe next Comic-Con." He did tease a bit, adding, "Everybody evolves."