Can’t wait a few more days for Halo 4? Then Major Nelson’s rundown of a live stream with the development team is probably what you need.
Produced a day or two before Halloween, the live stream has multiplayer with live chat via the dev team, or simply raw footage with audio. It’s a great mix. It’s near 90-minutes, where you can glance menus, new weapons, armor abilities, maps, modes, weapon drops, mechs, and the stunning new visual engine. It’s fairly exhaustive, with the lid only being kept on story elements.