Guillermo del Toro, attached to direct the film adaptation of Justice League Dark, recently commented on WB’s plans for the DC filmic universe. His clues hint at a much broader DCU being developed.
“We’re still on [Justice League Dark], writing, and hopefully it will happen but there are no developments that are new. We’re still at Warner Bros., they are making plans for the entire DC universe. All the superheroes, all the mythologies, and part of that is Justice League Dark. They’re planning on TV, movies, and all the media, so we have to fit into that plan.”
It certainly gives credence to all the rumors circling of a Wonder Woman cameo, Nightwing appearance, and it has already been confirmed that Barry Allen Flash will be appearing in CW’s television show Arrow. What remains to be seen at this point is how connected all these universes will be.