New Chris King Freehub design
The new Campagnolo pattern freehub has been pared-down to just 4 contact points.
Previously, when a well-used freehub was analysed, it was always the case that there were only very few areas that the cassette actually touched.
Unlike Shimano pattern freehub bodies which have to accomodate a wide range of designs (sometimes ill-fitting), Campagnolo bodies have deep splines and never really gouge or wear down.
So, some extra grammes saved and a tidy design to boot.