Yep, it's official...Import GameCube's will not play US software. Blame IGNCube for the bad news not us!
Not that this is really surprising, but imported GameCube's will not be able to play US software. At least without any future modifications that are still unknown.
This may change your mind on importing next month.
Planet GameCube will be looking into this further...but for now...it looks like importers will have to brush up on their Japanese.