This is a prototype toy from the NYC Toy Fair. According to Phil Torrone from Make, the engineers are hawking this amazing contraption for production.

It uses linear propulsion to propel the magnet “cars” around a solid state track. Like a MagLev train, the cars float in an electromagnetic field, pulses in which will cause forward motion. If my high-school physics is letting me down here, I’m sure you’ll pick me up in the comments. There is also a prototype fan. In fact, this frictionless propulsion could have any number of uses.

Amazing linear propulsion systems – no toy application (yet!) [Make Via BBGadgets]