They didn't reveal exactly how they'll work together only that they would. So far Child of Eden has been showing off its love for Kinect. PS Move won't be neglected.
Rumours began that Microsoft was helping Ubisoft market Child of Eden provided they keep a very pro-Kinect public appearance. It's unlikely however and Ubisoft just probably feel that Kinect offers the most unique enticement to the music-based shooter.