You're gonna love the Gen4, Kawa did a bang up job on this bike.
Based on what I've seen and heard, the Mechatronic shock would be good for road riding. If you do a lot of track riding, the standard Ohlins shock would be the better option.
Also, you're going to want to flash the ECU on this bike as the U.S. models are quite restricted. The new Quickshifters should be available soon from Woolich Racing too so you may want to read up on the flash kit and the new features that come with the QS.