Actually won these placing 1st in the PS All Stars demo. Everyone who plays gets the voucher automatically, but the Killzone Sniper class stealth is only given to match winners. I was lucky enough to use Kratos. I've seen others use him and win. The game is fun, and is a direct copy of Super Smash Bros with the gameplay.
One of the sigs there is Victor Lucas, of Electric Playground/Reviews on the Run.
Sig by Adi Granov, who's under Marvel. He worked on Extremis and the first movie, by helping design the suit.
Going again next year. Kinda angry at myself for not waiting for the full schedule and getting the tickets ahead of that. David Hayter, who does the voice of Solid Snake/Big Boss is showing up today, but I have no money to go. :(