LOL
Yep, a hard drive for Gamecube would definately revolutionize the world of gaming.
Anyway whatever it is, it wont be revealed until 2004, so meh. Probably just the GBA2 or GC2, or some new way of playing games, eg holographic, VR. Or could be Mario 128. Or could be Kirby e-reader cards, GET EXCITED EVERYONE!