The devices do not include electrical wiring or battery replacements, making it a likely candidate for powering remote sensor networks and medical-sensing technologies.
Two-dimensional tracking would be managed via the existing Move's visual spectrum camera, or by using a display-mounted IR emitter in conjunction with a remote mounted sensor (again, just like the Wii controller).
Back in March, Switched On discussed a number of Kickstarter projects (all of which have now shipped) that extended sensor-based monitoring and notification to remote locations (provided there was WiFi or Bluetooth connectivity).