http://www.youtube.com/watch?v=JXmBrD4b4EI&feature=youtu.be

nice but had already seen this some years ago on discovery

This product is claimed to be newly designed, and just coming into existence : http://www.bicymple.com/

Wonder how it got on Dicovery earlier

There have been rear wheel steering models before, but they all had the handle bar turning but was attached to the real wheel.  This one seems to be turned by the rider's hip movement.