In the near future it is no longer obvious that a Porsche 911 Carrera will be powered by a naturally aspirated engine, according to a Porsche technician in an interview with AutoVisie.
Turbos are purely for improving the performance and are still only used on the top models. But the combination between smaller engines and turbocharging is a very promising way to lower the fuel consumption and CO2 emissions. Because of these two factors we will be offering turbo engines in models below the top series in the future. A four-cylinder boxer engine with a turbo is conceivable. But as before, the name 911 Turbo will only be for the model with the highest level of performance used.
Regarding a Porsche 911 (991) hybrid the Porsche person was quite clear;
As yet we have no hybrid version of the 911 planned. Actually this is purely because of the extra weight that the technology brings. But, never say never. We have the required technology inhouse and the platform is suitable for the powertrain.