Green Lantern concept art was previously released at last Summer's Comic-Con (see below), but it still has yet to make its way officially online. Interestingly enough, the art looked a lot like Chris Pine, who recently denied GL rumors, and has a role in Wonder Woman as Steve Trevor. The "Dawn of Justice" special didn't feature the art, either.
During tonight's "Dawn of the Justice League" special, Kevin Smith asks DC Entertainment Chief Creative Officer Geoff Johns to fill them in about something nobody knows.
Johns said Green Lantern will be coming to the Justice League Universe.
"We've been to the bottom of the oceans. We've been to ancient Green mythology. We've been to the past and future of Flash. We've been to the digital world with Cyborg," Johns said. "We still got to go to space. So the Green Lanterns and the Green Lantern Corps will be coming to join the Justice League Universe."
While Geoff Johns really didn't offer much, if we take his words literally, it sounds as if the Green Lantern Corps already exists and will be making themselves known to the rest of the Justice League characters (at least that's my understanding) some time down the road. Johns' words also seem to confirm the rumors of more than one Earth-based Green Lantern (as Johns says "Lanterns").
Green Lantern concept art from San Diego Comic-Con: