From 1stUp, Halo 2 will be released November 9th. Mark your calendars, and prepare for a 1-2% drop in productivity. 

There will also be a limited-edition version pre-order version: “Microsoft also confirmed that gamers will be able to pre-order a limited-edition version of the game. The special edition will come packed in a metal box with the game and an extra DVD of new content, including making-of documentaries, DVD-style featurettes on different aspects of the game's development, commentary from members of the development team, cinematics and characters that wound up on the cutting-room floor, and an art gallery.”

Article on multiplayer Halo 2, Multiplayer videos