Now that the DCEU has started to find some traction, Aquaman will take the plate as the next solo movie after Justice League, with Justice League Dark and Batgirl currently standing as the next two DC films to begin production, although neither film has a set release date.
DC appears to see the value in branching off and trying new things, and both of these films are indicative of a growing trend of bold moves in this universe.
It’s worth remembering that the DC slate has shuffled several different times over the course of the last year, but things do seem to be leveling out.