No camshaft and complete control over each individual valve. They have the ability to hold an individual valve in the given position, close it open it, cylinder deactivation, rapid catalyst warming on cold starts... do whatever. Shaves like 40 lbs they claim. This particular video is really an interesting view. It's a 1.6 liter engine that they're working to modify, and although the engine comes from a Porsche, 1.6 L is the size of many of the engines on this forum.