The Halo 4 fansite The Halo Council was present the San Diego Comic Con this year, where one of the things on display was Halo 4, which had a booth replete with stations to play a demonstration of the game.
Among the features demoed at the event is a mission from Halo 4's Spartan Ops cooperative mode, lasting a little under 10 minutes in length.
The demo is no different than what 343 Industries showcased at the Rooster Teeth Expo a few weeks back, but thanks to footage captured by the fansite, we now have a full length viewing of the mission and all it has to offer.
Among one of the newly revealed elements of the game is the confirmation that fall damage is back in.
Halo 4 looks like a definite successor to Halo 3, and I for one can't wait to play through the Spartan Ops missions again and again.