All very nice, but is it sustainable?
Hydrogen is nice, but its not exactly sustainable. Hydrogen is currently produced in quantity from cracking crude oil, not from electrolysis. Fuel cells require platinum, which is a very rare metal. The car is a nice concept, but its not a sustainable model for the future.
There was a concept for a car built from bamboo (Honda or Yamaha, I think) that could be pedaled in rush-hour traffic or driven with an engine when the traffic sped up. Very light vehicles (velomobiles or bicycles) are really the future of personal transportation.