This news comes form the translated-news site Japan for Sustainability. The announcement came back in February, but JfS just posted the translation this week, and my Japanese is certainly not what it should be so I didn't spot it earlier. According to JfS, "the newly developed system cools or heats the driver's cabin without running the engine when the truck is parked. This feature contributes to cost reductions as well as reduced CO2 emissions. The Package cooler installed on the cabin roof cools the cabin, while an electric blanket and electric carpet are equipped in the cabin for heating."
Stop Idling should be commercially available in March 2008.