ax pointed out in the community forum that Planet GameCube is reporting that Nintendo is allowing retailers to sell the GameCube as soon as it arrives in stores. Apparently the FYE stores in Connecticut are already selling the new system, which wasn't originally going to be made available until November 18.
If you have pre-ordered the GameCube, you may wish to call the store you purchased it from because if they have received the shipment, you will be able to start gaming a few days earlier.