Toon Tumblers, makers of some really awesome glasses featuring some of your favorite comic book heroes, revealed one of their San Diego Comic Con exclusives last night on Facebook, a Justice League tumbler. And here's the artwork:
As you can see, it features the seven heroes we've seen in the preview shot that's been making the rounds since DC announced the new Justice League book coming in September (the original seven - Martian Manhunter + Cyborg), as well as several more heroes -- Firestorm, Atom, Deadman, Hawkman, Green Arrow, Mera, maybe Black Canary and another character I couldn't easily identify, but DC Women Kicking Ass identifies as Element Woman.
No official word has come from DC that these characters are indeed the rest of the new Justice League, so it's speculation at this point. It makes sense, based on the design, but for some reason I thought they said there were only seven more characters in the League, not eight. But maybe I'm misremembering.