The technology has been around for quite some time... probably floating around University labs for 30 or 40 years... and commercially viable for the last 20 years or so.

Not sure if I buy the cost per mile, these thing have to suck a LOT of electricity to create the magnetic fields, and then to propagate that field for hundreds or thousands of miles. Like most "green" technology, the TRUE carbon footprint is swept under the rug; how about electric vehicles that actually have LARGER carbon footprints than gas vehicles due to the toxic process of battery manufacturing and disposal.