What we dont know of course (or I dont know anyway) is just how much electricity it takes to make hydrogen, if its much more than using the dual fuel prius, then would the prius (and battery technology) be more cost effective?
Its good to see that Toyota have done what hobbyists have been doing for about 8 years anyway. Only has a range of about 6 miles on battery. Might be good for some people who generally use their cars for short trips or can plug in at work.
Hydrogen takes around 5 times the amount of electrical energy to extract from water than it gives back under conventional thinking. Anyone who believes anything else seems to get called a nutter or shot (if you believe some people). Maybe there are other routes to making hydrogen though. I've heard of some but I'm not sure how sustanible they are.