Following the premiere of Batman: The Killing Joke at SDCC, limited-screening from Fathom Events and release on VOD platforms, the animated feature's special features have leaked online and include a sneak peek at the next WB Animation feature, Justice League Dark. It would appear the Justice League Dark's roster includes Zatanna, Etrigan the Demon, Swamp Thing, Constantine, Black Orchid, Boston Brand and...Batman(?).
It also appears that the regular Justice League will appear as well so maybe Batman just functions as a liaison? Appearances from Superman and Green Lantern (John Stewart) were also revealed in the advanced look.
Matt Ryan voices Constantine, Jason O'Mara continues his work as the voice of Batman, Tomb Raider voice actress Camilla Luddington voices Zatanna, Nicholas Turturro is Boston Brand and Ray Chase voices Etrigan. No word yet on who's provide the voice for Swamp Thing.
Justice League Dark is expected to arrive on blu-ray, DVD and VOD this Fall.