According to Warner Bros.' CEO Kevin Tsujihara himself, at least as quoted in The NY Times, there's a whole series of DC-derived movies to be announced soon. The Times make it sound like Justice League will be amongst them.
Two new television shows are coming to the CW and Fox, including one based on the Flash and another on a young Batman, and a film series will be announced in the near future, Mr. Tsujihara said. It is expected to include a Justice League movie.
I'd guess this is likely to be a handful of DC comics movies that will share the Batman-Superman universe and not, say, whole a new Green Lantern trilogy. Or maybe I'm wrong and they will, for some reason, announce a string of pictures, all at once, all based on the same single character or comic.
I'm thinking Aquaman, Wonder Woman and Justice League, maybe a new, John Stewart Green Lantern. Or perhaps it will be Joseph Gordon-Levitt's Sandman and Guillermo Del Toro's Swamp Thing-inspired monster mash-up. Or maybe all of the above. I vote for all of the above.
The key part of the story is probably "soon." And I think "soon" probably means Comic Con. Something to look forward to.