In addition to this peek at Wonder Woman, guests were shown a small bit of footage. Here is a description via Matt Goldberg:
"It’s pouring down rain in the night sky. Batman is an armored suit, his eyes glowing, and standing next to the Bat-Signal. He pulls down a switch and powers it up. The Bat-Signal (bearing the new Bat-Symbol) blasts into the sky. We pan to follow the light, but in the sky, floating in front of the signal, is Superman. His arms are crossed. His cape billows in the wind. Batman, with his mask’s glowing eyes, stares down the Man of Steel. And the Man of Steel stares back. His eyes begin to glow red. Cut back to the Dark Knight. He is unmoved. Cut to black."
Batman v Superman: Dawn of Justice is currently scheduled for May 6, 2016.