Business in the front, party in the back. The additional jogwheel may or may not be a response to the dual iDrive-style instruments which may or may not be found in the next-gen Mercedes S-class. It's really all just wild speculation right now. BMWs optioned with both rear entertainment and comfort packages will feature the second iDrive between the rear seats. Now backseat drivers will be able to access the navigation system and control the radio and dim the interior lights and determine the amount of fuel left and just do a whole bunch of stuff that distracts them from what they should be doing, which is just sitting there and enjoying the ride until the chauffer pulls into the country club gates.