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However I'm not sure how much of a success it will be because people really seem to expect something spectacular, something much more powerful than the 996 and something completely new.

- Very good point.

My personal guess is that this is indeed an all new model. If it wasn't it would still be called the 996. Even though the E60 5 series contains parts from the E39, does it make it an E39 5 series? Absolutely not. Parts go from generation to generation and eventually become phased out. Why should Porsche or any other car manufacture for that matter spend extrodinary amounts of money on all new parts for every all new generation. Not puting any words in anyones mouth, just making a point.