For me Porsche has always been about innovation and as such, I wonder more about the future 911 engine as the 6 can only grow so big, lets say its a v8, that being the case, porsche may move to a mondial type setup, with backseats and a midengine, or a hybrid mid-rear engine...to be honest, while they have been putting the engine in the middle (CGT, boxster) lets not forget that mid engined competition (gallardo, 430 etc) are not beating the porsche, just competing with a diff motor position, the rear engine is very much modern imo.