Aquaman is slated for release in December 2018, and Shazam! just started production this morning, but beyond that we don’t really have a full idea of what’s going on.
Right now, the whole production schedule for the future of the DC Extended Universe seems to be totally up in the air.
At San Diego Comic-Con back in July, Warner Bros. announced a full slate of upcoming projects, but failed to mention when any of them will actually be coming out.
We definitely know what we are getting a Suicide Squad 2 (it was highlighted as part of the official title announcement), but it seems like we may not see it until after a good number of the other projects currently in the works.