Gregg Miller posed the question "Would you ever do "Justice League Dark" on TV or Netflix?".
"Right now the plans are to make it a feature. We are deep in the screenplay writing phase. I think we see eye to eye (Warners and DC and myself) on what the movie is and I think it will serve really well as a movie."
He went on to praise the characters and express how much joy he is having with the characters such as Constantine and Swamp-Thing. When asked about the TV universe and Constantine, he went on to say...
"The ideal form is to develop the movie. The only thing I made clear to them (the Constantine TV show) is that the TV series will not affect the movie and they said that's okay. Now if we see the TV series and we can mesh with it or cast the same actor depending on where the movie is going then I would be happy to consider (meshing with the show)."
He then went on to say...
"We came in and I tried 2 or 3 different structures for the screenplay. I wrote a 75 page template for the universe... that takes a year... We needed to create a new story. Then we need to go to a screenplay writer. One draft takes between 6 and 8 months. It really takes a while."
You can see the interview here.