I can't get excited about hydrogen at this time. NG, electricity, or etc. are needed to produce it; which makes it inefficient. One can use compressed NG or batteries to power the same vehicle without the inefficient hydrogen step. I'd be more interested in plug-in hybrids or vehicles to run on compressed NG.
Ethanol from corn is a mistake, corn is too expensive. They need to produce it from abundant waste cellulose. All IMO.