just read this article. I know it's a year old, but the tech they are using is even older and way over priced for what it is. RC planes, cars, and boats have been using brushless motors and Lithium Polymer batteries for over a decade and the price on a brushless setup with speed controller and batteries is in the range of a few hundred dollars.
example: A 2400 watt brushless electric outrunner motor with the equivalent of a 50cc motor is about $80. A 12S lipo battery pack (44.4 volt, 4000 mah) is about $200. An 80Amp 44v speed controller for the brushless motor is about $100.
You could build one of these for less than $400, That's retail... these guys are going to be banking about $1000 dollars on each board they sell. They might try to be less greedy and give up the whole "mysterious new technology" approach. Selling a lot of these for less profit would be easier than selling a few of these for disgusting profit.