We haven't seen the end of Joy Ride, at least not according to the Australian Classification Board. The organization has outed "Joy Ride Turbo" from Microsoft Studios. Exactly what Turbo has to do with Kinect Joy Ride is still up in the air (doing tricks, presumably).
Could Turbo be closer to the original, free-to-play XBLA kart racer that never was? Possibly. Will it be another invisible-steering-wheel Kinect title? Probably.