This is a more exciting prospect than the electric revolution that is currently being forced on us.
You’d think it would save on a hell of a lot of charging infrastructure. On the other hand, that infrastructure will effectively cut out the middle-man with power fed directly to the vehicle rather than via hydrogen. Whether the production could be scaled is an interesting question. Obtaining hydrogen from water (assuming that’s what they do) is quite an energy-intensive process. Those H2O bonds are a bugger to break. Still it’s good to hear that a lot of manufacturers are working on it.