It´s confirmed, Carrera PDK is good for 700Nm, and even more for the Turbo
Take a look at this film from ZF. It was presented way before the release of the 997.2 Turbo and it says the Carrera PDK to suport 700Nm and good for 8000rpm.
The film takes 7,20min, take a look at 6,07min.
http://www.zf.com/corporate/en/products/innovations/7_speed_dualclutch/7_speed_dualclutch.html
J.Seven