The new Chorus 39/53 standard crankset has a new logo and Campagnolo's new XPSS chainrings
Users of the previous generation 11sp will have had no complaints with their shifting but the new XPSS (eXtreme Performance Shifting System) raises the bar for front shifting to a new level. A new teeth design plus the new 8 ascending and 2 descending zones of the chainring enable top-class performance allowing even faster and more precise shifts.
An additional benefit of the new chainring design is that the inner ring is threaded to accept the chainring bolts (instead of seperate chainring nuts) making for easier and safer chainring changes