not much to be sad about there man. a V8 hybrid pushing 6-700 HP from the factory, and AWD so you can actually use that power? Hell yeah man! We currently have 4 cylinder mustangs that can run circles around cars like mine (71 Mach 1), and we're talking cars so powerful that even with all of the tech available today you'll roast a set of tires in minutes. It is a good time to be a gearhead. And they aren't nearly as bad to work on as I once thought either, albeit there isn't the room in the engine bay like there was on the classics...Well, there is still the possibility of a hybrid mustang on the existing S550 platform. doubtful it will be AWD but possible.
the S650 it is expected may well have a full electric variant. hybrid is almost guaranteed at this point, possibly though a still fully ICE variant.
and also with the power numbers being poured out these days, an AWD is very likely on the S650. Things have passed the point of being able to get all of that power to the ground in a RWD with even some factory backed engine upgrades like the Roush supercharger.