Just browsing around trying to get some more info on the game modes for multiplayer and stumble upon this:
"Gears of War 3 will include a new mode called Beast mode. It is the opposite of Horde Mode in Gears of War 2, the player instead attacks COG members as Locust. Tokens are earned for killing enemies, allowing the player to upgrade their character to a stronger class of Locust. Horde Mode will also reappear in the third installment. Original multiplayer modes are back in Gears of War 3, but with a twist. In "Team Deathmatch", a game similar to Warzone, every team has 25 respawns (30 lives including starting ones) per round, and when the lives run out the game-mode turns into a regular Warzone match (not true, in Warzone players do not auto revive, they simply bleed out, TDM uses a mixture of Warzone and Execution rules). "Capture the Leader" is a combination of Guardian and Submission, and the leader will have to be captured and held for 30 seconds. But, the leader will still be able to struggle and knock his captor around. The struggling causes minor damage and can turn a match around."
Might be old info for some users but for the benefit of the forums it's been posted