The initial reports of Ava DuVernay coming aboard The New Gods mention that this film may or may not be a part of the DCEU.
So it sounds like this mythic tale might give Ava DuVernay the freedom that she might not have enjoyed on Star Wars.
At the same time it could still wind up being connected, and basically act as a gateway to DC’s cosmic characters.
Much like Thanos loomed in the background of Guardians of the Galaxy, so too can Darkseid play a role in The New Gods, and be built up before a connection is finally made and he becomes the true big bad in the DCEU.