Saw this at the SAE World Congress this week and thought it was pretty cool. Sorry for the crap pics, only had the cell phone with me.
By incorporating an additional linkage onto the bottom end of the connecting rod they can effectively lengthen only the expansion and exhaust strokes of the engine cycle. In essence they reduce the pumping losses of the engine and are able to convert more gas pressure into useable work during the expansion stroke. A claimed 20% improvement in fuel consumption. I was told this technology WILL be coming to their small engine lineup eventually (mowers, generators, etc) but nothing for autos - yet.
Heres a low res video of it in action: