This is a cool concept, although I doubt it will be ready by 2014 at their current rate. My reasoning on that is that you have to have a complete pre-production vehicle before you can even start safety testing. But that isn't a knock, I like optimism as much as the next person.

The horizontal flywheel concept is quite cool, and I'm glad they avoided the problem of earlier attempts which just had one (cars that did this would change their front/back weight balance going around turns in a non-helpful way) Having both (and running them in opposite directions!) means you can cancel out that effect.

I'd worry a bit about the need to keep them spun up at 'idle', its a work load that electric vehicles don't normally carry, but you do get some of that back in efficiency gains when using them as dynamic energy storage so perhaps it is a wash. Would love to see the math on that.

If they wanted to hit the tri-fecta of buzzword viral bingo they should use a 3D printer to print the body out of carbon fiber or something :-)