Two more Justice Leaguers have been tapped to appear in
Injustice: Gods Among Us. Below you'll see in action J'onn J'onzz, aka Martian Manhunter and John Stewart. Both seem to be voiced by the people who did them in the Justice League Unlimited cartoon series, which I definitely love.
J'onzz looks pretty awesome here and I love his ultra move. It's got a Shang Tsung flavor to it for a brief moment and then he gives Stewart a big surprise at the end.
Stewart will probably just be a new skin for Hal Jordan. I actually like the bald John Stewart over the one they have in the game though. Also, it looks like you'll also be getting the martian skin as that's teased at the end of the video.