I hope they release it for the cube.
But, Nintendo has a habit of cancelling games for an outgoing console, and then releasing them on the new systems. For example, on the N64, Animal Crossing (released in Japan for the N64), Dinosaur Planet (completely {bleep}ized into a Starfox game), and Eternal Darkness were all close to completion before the GCN was released. (I played Dinosaur Planet and Eternal Darkness myself and besides being on dev carts, the games seemed complete.)