The latest rumor is that some versions of the next A4 and derivatives will ditch torsen in favor for an E-Tron quattro set up with rear wheels driven solely by an electric motor.

http://blog.caranddriver.com/audi-wi...next-gen-cars/

The concept isn't new as Lexus Rx hybrid has had a similar approach as does some Peugeot hybrid that I can't remember, and the next Acura RLX and NSX. And of course Le Mans winning R18 E-Tron quattro (in reverse). Discuss.