Goldeneye: Rouge Agent looks pretty cool, but the real question is is whether or not the storyline and gameplay will live up or out-do its predecessor.
And then years later Halo comes out and snatches it's title! It sounds rent-worthy, I wish Rare was involved someway though. edit: It'd be badass if they ported the original N64 game to GC as a bonus like they did with the Zelda game.
I have a feeling it will go away from the storyline. The cool thing is, though, that you are the badguy.