Wonder Woman will be filmed this fall. Suicide Squad will shoot until September. Justice League will start shooting next spring. Aquaman will be after that.
On DC's cinematic universe:
Zack Snyder: "I want all the other directors of the other films to be able to stretch their legs and do what they want, but at the same time there is a big interconnected universe. I have given everyone amazing access to our story, to me, and what we are doing. All the films have like minded conceptual jumping on points."
producer Charles Roden: "We call it the sandbox. It has borders around it, but everybody gets to play in the sandbox. On Suicide Squad, David Ayer has a lot of specific control over his area of the sandbox. Even if he crosses the line a little bit, we see if we can push our boundaries back a little bit."
On DC vs Marvel:
producer Deborah Snyder: "I can see how people would want to make it this big, intense rivalry. Listen, they are so great. I loved Guardians of the Galaxy...our films are a bit more serious. They deal with things that are a little darker. Things that place them in our world."
source: 1, 2, 3