The Warner Bros panel in Hall H opened with a surprise: Zack Snyder showed up to reveal some quick Batman v Superman: Dawn of Justice* footage of Batman and Superman GLARING at each other.
A rainy night on a city rooftop. Batman, wearing the chunky armor from The Dark Knight Returns - glowing eyes and all - stands next to the Batsignal. He turns it on, rain falling down his metal helmet. The camera swoops around, the Batsignal hitting the clouds... and Superman, floating right in the center of the Batsymbol. He glares at Batman. His eyes turn red. Batman glares back at him, his eyes glowing green/blue.
Cut to the title treatment.
The Batman armor looks exactly like what we see in Frank Miller's comic. It looks great.
* Still the actual title