Bungie titled this new Halo 3 video "Is Quisnam Protero Damno!", and it's basically a long look at the making of Halo 3's Multiplayer game. Here you'll meet the Multiplayer team and watch a level get built from concept to completion. You'll see the care and attention that goes into every aspect, and yes, you'll see a level or two that nobody has ever seen before. Note however that all of the game footage in this vidoc was taken during the Alpha stage and isn't even representative of what you'll see in the Public Beta, let alone the final game.