I just saw this today.
Check it out , it seems OK. But in prototype stage.
The video is about 26Mb to download but is worth it.
It combines magnets, RC and slot cars technology without the slots, to give a realistic racing experience.
6 cars 2 lanes on a track the same as a 3 lane routed board track.
Very interesting.
http://www.magracing.co.uk/car_track_concept.html