Kill Confirmed, a new multiplayer mode for Call of Duty: Modern Warfare 3 was just announced during the CoD XP live stream. When you kill an enemy he drops his dog tags, and in Kill Confirmed the only way to increase your score is to collect them. If you see your teammate get shot, you'll have the chance to grab his dog tags preventing the other team of getting points.
If you see floating dog tags you can bet there will be players near by to claim it. This adds another level of strategy absent from previous multiplayer modes. Getting the kill isn't the most important part of the game anymore, now you have to confirm it too.
CoD: MW3 will be released on November 8, 2011.