HHO gen stock on 2010 mazda euro spec diesel

Hey i seen a review of a car today and was wondering if anyone seen or read about this. a new Mazda in europe with a turbo diesel comes with a system that uses Urea and deionized water. video says its pumped into the exhaust to lower emissions
http://www.youtube.com/watch?v=jVoFooIcBvM

I've heard of systems like this for large stationary engines (as that's what I'm involved in), for reducing emissions - particularly NOx gases - but not on cars. That's a first.

Cheers,
Martin.