Just out on our internal news so I have no link to it yet.  BMW is now testing its first gasoline/hydrogen hybrid vehicle and plans to bring it to market as soon as reasonable infrastructure exists for the hydrogen fuel.  There is little to no performance difference between the gasoline and hydrogen.  The engines are being introduced as hybrid because of the limited infrastructure therefore buyers will need to be able to take advantage of existing gasoline availability to avoid limitations.  While on hydrogen the car only emits water vapor as exhaust.  Fueling stations are completely robotic so there will be no more self service either.