We thought they revealed a new stage, which was a cross between Warhawk and Uncharted, but it turns out that it was just shown in part of the video that got the game the greenlight. So it wasn't an official announcement.
For all we know, that stage didn't make the final cut. --- Awaiting: GW2, Bioshock: Infinite, The Last of Us, GoW:A, Playstation All-Stars, AC3, Watch Dogs, Beyond. PSN: Ambulance-Chaser