Re: ...and a slight digression from ER's post...
It is going to be a steep price in one regard: no filling stations. It runs on hydrogen in an on board compressed-H2 tank. Hydrogen itself will require fossil fuels to produce and transport... so, there are some additional costs. GM has also come out with a prototype with three LONG tanks that are under the seats and an electric motor at each wheel hub. I applaud the innovation, yet one word keeps coming to mind: Hindenburg. Last I checked, no prices were released from GM.