*UPDATE* And here's the updated, higher res version.
Warner Bros. has kicked off Saturday by basically throwing down the Comic-Con gauntlet right at Marvel's feet. After opening up all the screens to give the Hall H crowd a widescreen presentation, the panel kicked off with concept art from Batman v Superman: Dawn of Justice. That was followed by Zack Snyder coming on stage, feigning to not have any footage (they all say that), only to reveal the first teaser and understandably the crowd went ape-dump.
In short, the footage shows a rain-soaked Gotham, where a Batman with glowing eyes and donning the Bat-Armor seen in The Dark Knight Returns, shines the Bat-Signal into the sky. But rather than seeing his insignia, it's instead a very pissed off Superman hovering in the air staring down at him, eyes blazing red. It was awesome and the crowd was as electric as I've ever heard them. Again, Marvel has a very tough act to follow.
The panel basically ended with Ben Affleck, Henry Cavill, and Gal Gadot coming up on stage for a brief moment, allowing the crowd to take photos. On the screens were splashed posters for the film, giving us our first look at Gadot as Wonder Woman. It's not the clearest image in the world but we will update it when possible.