Some great info on the GT3 RS and the 991.2 from Car and Driver, after an interview with Wolfgang Hatz....
http://blog.caranddriver.com/2016-9...ew-engine-and-possibly-manual-gearbox-option/
http://blog.caranddriver.com/2016-9...ew-engine-and-possibly-manual-gearbox-option/
Beyond this generation of 911–that is, looking to the model we'll be expecting to see in 2019 or 2020–Hatz said that we're almost certainly looking at some form of hybrid powertrain to meet emissions targets. But although the Boxster and Cayman will soon receive turbocharged flat-four engines, at least in the lower reaches of the range, he also went on record to say that the 911 will always stick with a six. 'We don't have a problem with a four-cylinder sportscar," he said, 'but never on the 911. The 911 has to remain flat-six."