From the part catalogue ("October 21, 2017 through Current Production", previous was - "October 14, 2016 through Current Production"): - New part number for the MCU (same part for S and X now.) - New part number for front lights. - Automatic circuit breakers for the 12V system. - Redundant power for servo. - Double the cables for the radar, primary and secondary, perhaps a second redundant radar is coming? - Secondary Autopilot ECU. 2 AP ECU, or perhaps just redundant power supply? 30A and 10A.