This might be a silly sounding story thats not. I remember seeing some little one-man gyrpcopters flying around at a local airfield one day twenty years ago. They were unbelievably quick in three dimensions. The guy would be near ground level, then a little speck way up there, then do an almost 90 deg turn up, down or sideways.
This bike concept wouldnt be nearly as manueverable but it would still add a 3rd dimension to one's riding experience. A 3rd dimension that, even at modest speeds, makes a Hayabusha seem like a riding lawnmower.