Progress is inevitable... but I feel everyone is incorrectling anticipating as large a leap forward from the C5 to C6 as there was from the C4 to C5.
If that was the case, then the C6 would jump way passed the likes of the Pagini Zonda and Enzo etc in terms of performance - which is not on the cards.
The C6 will probably sit right at a CAI modded Z06 in stock form.