Looks like they did exclude GL from that concept art because they have the whole Corp coming. We might even see a brief JL vs GL Corps battle in JL film? Maybe that is one of the reason the GLs comes to earth, to confront JL to make sure they aren't bad for the planet?
To close out the DC Films special airing on The CW Kevin Smith asked Geoff Johns to reveal a world exclusive, to confirm the seventh member of the Justice League in the DCEU and end the show with a bang. Johns certainly didn't disappoint. "We've been to these cities, we've been underwater, but there's one place we haven't been to: space. But now we are. So the Green Lanterns and the Green Lantern Corps are coming to join the Justice League universe."
Green Lantern will be joining Batman, Superman, Wonder Woman, Aquaman, Flash and Cyborg in the upcoming Justice League. However, he won't be coming alone. Geoff Johns confirmed not just Green Lantern but the entire Green Lantern Corps. The implication of his statement is that Justice League will have more than just one ring wielder. Images of Hal Jordan, John Stewart, Guy Gardner, Kyle Rayner and Simon Baz (sorry Alan Scott fans) were displayed on screen. When the Justice League forms, will they have not one but five Green Lanterns?