One of the notable things about Warner Bros. plans for the DC Extended Universe is that the studio has a number of films all in various stages of planning and production but after November’s Justice League and 2018’s Aquaman, nothing has a firm schedule release date.
That might have changed for at least two of the planned films.
According to TrackingBoard, ahead of San Diego Comic Con the studio has laid claim to two dates in 2020 for future DC related films. Those dates are February 14, 2020 and June 5, 2020.
Currently the studio is on record as having plans for The Flash, The Batman, Shazam, Black Adam, Gotham City Sirens, Nightwing, Green Lantern Corps, Justice League Dark, Suicide Squad 2 and Wonder Woman 2. Also there have been rumors that they are looking to do a Man of Steel sequel at some point.
The Justice League sequel was taken off the schedule so that they could focus on The Batman and other films, so that might still be a possibility depending on how the first film does.
Previously the studio had dates in April & July 2020 that were reportedly possible dates for Cyborg and Green Lantern Corps but there is no indication if those dates are still possibilities. With them grabbing February & June dates in the same year it seems unlikely that Warner Bros. would want to shove out 4 DC hero films in such a short window of time.
As for which films would fill those 2020 slots, that is harder to say. It would all depend upon which films are closer to being ready to production by end of 2018 or start of 2019.
At least one likely choice is Wonder Woman 2, and there are reports that the studio will be announcing a release date for that during SDCC. With how well the film did this summer it would make sense to get a sequel in motion as soon as possible.