I'm looking forward to this one, mainly for the single player.
I've enjoyed all of the Halo games, but I've gotten very into the actual story since reading most of the fiction. So far I've felt that REACH did the best job of matching the fiction....in that it made you actually feel for the humans under that armor. Based on interviews so far, Halo4 is going to continue that trend. True to the fiction, Cortana is just about at the end of her lifespan and 343 is finally acknowledging that.
Strive for that moment when you're only a slice of pizza and a hooker away from paradise.