Very cool,much better then the Sprinters they could have gotten.

I'm not being negative to the idea but is this the future or are they repeating the propane fueled van experiment from years ago?

Propane/butane (LPG) is widely used in Europe as an alternative fuel (it's taxed at a much lower rate than gasoline, giving an approximate cost of $4/gal versus $7-8/gal for gasoline), but CNG might be much better. If it becomes widely available (infrastructure-wise), it might prove far superior to LPG. Anyway, I'm glad the manufacturers are working in this direction; natural gas should be much cheaper than gasoline.