Unless they are allowing multiplayer teams to choose more than just red/blue for colors, this picture then is from a co-op game. Now, if you look in the bottom right at the warthog, you will see a third spartan's visor sitting in the driver's seat. I think that Halo 2 will now allow more than 2 co-op players!
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actually i think that is the SINGLE PLAYER... if you've read the book "First Strike", this NEW screenshot bares some resemblance to the "tunnel" part of the book...