It woudn't be the first game to be pushed to the next generation, much like starfox adventures and eternal darkness.
Nintendo states a lot of things, if they did what they say every time we would already have the revolution, had played zelda in the gamecube and not having this argument.
Don't get me wrong I would love for zelda to come out tommorow and for me to be playing it, but it doesn't seem likely nor beleviable that we will see it on the gamecube.