With every automaker attempting to out-green each other with hybrid vehicles at the Detroit auto show, we're unsure how this one flew underneath the radar. As we attempted to squeeze our way out of the Mitsubishi press conference, we stumbled upon this Mazda5 Hydrogen Rotary Engine (HRE) Hybrid tucked in a hidden corner of Mazda's stand.

It's not the first time a 5-based hydrogen hybrid has been shown in Detroit; the original concept was on display - in a similar locale - nearly two years back. Although at that time, the system was merely a concept, Mazda tells us they're now ready to lease limited numbers of the alt-fuel hybrid van to select customers.

(Click through for a gallery of live shots, more on the hybrid and a release from Mazda)