If other console games follow Halo 4's lead, then development may just shift entirely to PC and everything can be ported over to consoles. Microsoft has confirmed at least an 8GB install for the multiplayer portion of Halo 4. The company "highly recommends" using a hard drive for the "optimal experience," but you can get by with an 8 or 16GB flash drive. Owners of Core, Arcade, and 4GB models can use a pre-configured Xbox 360 flash drive or configure one of your own, but again Microsoft says a hard drive is the best option. Microsoft did not say why Halo 4's multiplayer needs at least 8GB of space, but it could be a way to ensure the maps and game modes are always ready to go. Halo 4 will launch on November 6th and I imagine the news of the 8GB install is a way to avoid confusion on launch day.