I don't see something like this lasting very long, but if it works it could help start a transition to H2 fuel cell technology, assuming that's going to be the fuel of the 21st century... maybe.
It's nice to see a major auto manufacturer working on something like this, but I personally think it's a complete waste of valuable engineering resources. Hydrogen is a viable alternative fuel if they can make it safe and do that before the oil crisis gets out of hand.
We've been building cars the same way for about 100 years. There were some milestones in this 100 years of development such as the automatic transmission, fuel injection, and OBD(on board diagnostics). These ideas aren't totally wasted, but they are based on changing one small part of a machine at a time. The Hydrogen powered car should be redesigned from the ground up, not based on the 100 year old ineffecient design we've been using. Why waste money developing something that we know will only last for a short while. I understand the transitional aspect of having a car that runs on multiple fuels, it makes sense because if we switch to H2 there aren't going to be fueling stations everywhere. But wait - if the idea behind hydrogen is that it separates water molecules into hydrogen and oxygen, why can't they just design it so you just add water?
Safety perhaps, but I'm seeing it more from an economic perspective. If the business of "hydrogen refueling station" replaces the gas station, the process of separating H2 molecules from water can be controlled to maintain a similar economy to our current oil economy. Water towers, wells, and lakes replace oil fields, Hydrogen extraction facilties would replace refineries, Hydrogen filling stations would replace the gas station. The oil industry would shift to hydrogen, and it would control the price of fuel the same way it does right now. Automakers would continue to make ridiculously inefficient "new technology" like this stupid tri-fuel truck to keep people from finally getting a break in fuel prices. These transitional vehicles can follow the same "planned obsolescence" marketing scheme that software manufacturers use. This is assuming that this new infrastructure can be put in place before the next great depression hits and people are so crazy that they can't remain organized.
Even with all of this said, I would still like to see these "Tri-fuel" trucks on the road - in place of the SUV's and pickups owned by people who don't need a vehicle that big but are too arrogant, ignorant or just plain stupid to change their ways or risk being seen in an "uncool" smaller vehicle.