Posted by Josh Straub at Game Informer on July 3, 2012:
The epic continuation of the Halo series is due in November and, according to 343 Studios, it’s almost done — but fans of the series may have to clean off their hard drives to get the full experience.
The game will require an 8GB install to experience the full multiplayer, which includes your traditional PvP matches, called War Games, and a new mode, called Spartan Ops. The latter mode features a co-op mode that will be be given new episodes each week. The full install size has not been revealed, but it is recommended that players completely install the game to get the full experience.
[Source: GameSpot]