A number of manufacturers had plans to roll out air-powered models by now, including India's powerhouse Tata, but all of them ran into trouble and delays along the way, so no, none of them are in production yet.

It's an intriguing concept that seems a bit more practical to me than hydrogen, since compressing air is a lot easier than getting around the challenges of producing hydrogen gas. I've been waiting for these cars for a number of years now just to see what can be done. Then again, the first air powered cars were invented way back in the 1920's, I believe. Heck, they even had battery-powered electric vehicles back then. We just keep reinventing the wheel when it comes to transportation, it seems.