Subaru AWD hybrid-electric:

 

http://www.wired.com/autopia/2009/10/subaru-hybrid/

When the car is first fired up or running at low speed, the rear motor propels the car. At higher speeds under normal conditions, internal combustion keeps the car moving. Stomp on the accelerator and the rear electric motor kicks in to provide extra oomph. Climb a hill and the front motor — which also kicks juice back to the battery — comes on to further enhance traction and acceleration. The slick Subie uses star/stop technology to cut off the engine when the car comes to a halt, reducing fuel consumption.

 

basically, RWD with selectable FWD, AWD etc will be possible with switches , so we may have a FWD with lockable 4wd soon.

I actually like this concept......I'm sure it will be bashed/torn apart and yuckified before it hits the masses.