Laws of thermodynamics are generalizations, so reality doesn't must "obey", it is perfectly possible that a new phenomenon exists and be discovered.
Laws of physics are a posteriori, they only have a descriptive value, reality rules.
Anyway I don't know if that kind of engine have been built.
But the hydrogen comes from water, you put water inside the car and then the water is processed. And yes, it seems that in this case there isn´t any new phenomenon (unfortunately), this time thermodynamics laws can sleep calmly, hehhehe.
Ah, and thanks for the information, ;)