One simple addition is that you're able to use the Sixaxis to manipulate the snake cam. After sliding it under a door, you can swivel the controller in order to rotate the camera's view. It's a small matter to be sure, but it does work well. If you're not a fan of using the Sixaxis controls, you can switch it off and use the right analog stick.
Another new addition is a revamping of the classic Presidio map as a Terrorist Hunt location. After selecting to play a co-op game, which is playable online, over LAN or split-screen (for two players), you're placed in an all-too-familiar location that's seen a few changes. The level seems mostly the same as the multiplayer map, though more boxes and stuff are scattered throughout the level for hiding and whatnot. You begin the level on the outside with the enemies apparently already knowing that you're coming for them, so if you just stroll up and open one of the suicide doors, well, you'll see why we gave them that name in the first place. If you've played the level in multiplayer before, you'll know that it's rather tight and compact, so when filled with a plethora of enemies you can imagine how hectic the battles are.
From a technical standpoint, Ubisoft looks to have the title running identical to what we saw on the Xbox 360. It looks to us like some of the bloom effects and other filters aren't quite as abundant as they were on Microsoft's console, for better or worse, which is oddly most noticeable when inside the helicopter and looking at your team before heading into a mission. Once in the heat of the battle though, it looks about as good as we ever remember seeing it.