I'd seen something about the Nissan Deltawing on wtf1. It did say it was racing under the number 0, and was ineligible for classifcation. Does look badass, though.
I like the idea that Le Mans and Formula 1, the sort of top levels of motorsport, are sort of heralding the next generation of ordinary road car development. Like the introduction of carbon fibre as a construction material, and the KERS system that was trialed a few years ago, I've seen a couple of cars that had a similar system. I'm pretty sure they were hybrids that used it, which would make sense.