Gets you thinking though, perhaps a bigger electric motor hanging off the gas engine would help the highway fuel economy by loading the gas engine more for shorter periods of time to recharge. I'm personally excited for the next generation 911 and "coxster" hybrids, which might retain a manual gearbox. The 911 could do well with a driven-wheels-only hybrid system since it's so rear heavy and less powerful than the 918.
Also the 4.5L V8 is kind of large, but the 3.4L H6s are a more reasonable size of engine that don't do too bad as far as fuel economy goes already, and with a start-stop system that aggressively charges the battery while the engine does run, with some engine tweaks we might be able to keep the glorious Porsche H6 sound