Only the PCCB, which is the ceramic brakes. £5K option IIRC, but the discs are a good few grand each to replace should you need to, and don't believe the whole 'lasts a lifetime' crap either, they're very easy to damage in both normal use and when changing wheels. Unless you have very deep pockets for servicing, then I personally wouldn't bother as you'd be better off putting the money towards the S.
When I said torque on the PDK 'box, I didn't mean you get any more than on a manual car, it's just that the ECU will open the engine up a smidge to apply a bit more torque than you would normally get during a gear change. My poor explaining, sorry.