Ford, GM, and Dodge have offered CNG trucks to fleets for years. Don't know if they are conversions (likely) or engines designed for the fuel though. Make sense to use an European model for testing. NG is an octane fuel, so a converted diesel should work better than a gas one.
You might want to look at more pics 2013 Ford C-MAX Hybrid and C-MAX Energi | The 2013 C-MAX is the first dedicated hybrid vehicle line from Ford | Ford.com It doesn't look like a minivan at all to me, its much smaller. The grand c-max that they decided not to bring over is minivanish. Ford decided to go hybrid and plug in only to see if that marketing would help. It should be a very nice package. Size in between the prius and prius v, with a high cuv seating position and more power. The question really is the price.
Yeah the ones I had seen looked like a big Fiesta which I would be down with. I'm sure more pics will be coming soon. Apparently Ford is bringing the B-max which IS based on a Fiesta here in the future. That one would be interesting too since it is a CUV kind of thing but barely bigger than a Fiesta. Things are really looking up as far as choices in the next few years.
it is small minivan... you can have tiny, small, normal, huge minivans, just like any other vehicle on the market.