It's pretty much showing the new perks, equipment, killstreaks added in Modern Warfare 3's multiplayer. Infinity Ward and Sledgehammer says their focus is all about balancing the multiplayer. So you won't see perks like One Man Army, Commando, and Last Stand(Yes!). Killstreaks have also been changed. You can still earn killstreak rewards by stacking the kills, but now you can earn killstreak rewards with killstreak points. These points are earned by capturing flags, doing objectives, etc. so team players will be able to earn something even though their not owning that many people.
Killstreaks are now placed in what they call Strike Packages. There's three packages to choose from - Assault, Support, and Specialist. Assault and support have a different set of killstreaks to suit your play style, but the one package that looks very interesting is the Specialist Package. The Specialist Package does not earn airstrikes or air support when you start racking the kills. Instead, you earn more perks. Starting with the regular 3 perks, as you keep killing, you start stacking more perks to keep you going. When you die though, you start from scratch again.
They also revealed their new game mode called Kill Confirm. Kill Confirm is a Team Deathmatch with a twist. When you kill an opponent, a dog tag drops on top of their body, you'll have to pick it up in order to count it as an actual kill. Now if you see an ally's dog tag lying around, you can deny that kill by picking it up.
Call of Duty XP is currently on Livestream, so if your interested in watching the rest of the show go check it out. Been watching it for a bit and so far this is what I've learned watching it at 3am. They revealed another trailer showing more footage of multiplayer, will update the post when they release the video.
Call of Duty: Modern Warfare 3 will be out on November 8 for Xbox 360, Playstation 3, and PC.