Read some rumors today that wb/dc plans to do a reboot of the dceu but in a somewhat confusing way.
So as of today, the "official" dceu franchises are: wonder woman, shazam, aquaman, , suicide squad, birds of prey and the flash who has a film looking for a new director again.
They also have a new "dc black" which is where the joker movie will fall and other films meant to be completely stand alone and not canon.
But then they have matt Reeves and his batman film and a supergirl film in development that do not fall into either category. The rumor is that the supergirl film and batman film will be in connected universes. Then the plan is for the flash to have a flashpoint type of event that will combine the Reeves batman universe and the current dceu, bringing in matt Reeves younger batman into the dceu and bringing in supergirl and the kryptonians.
Just completely rumors but I thought it was an interesting theory.