The M3 GTS and CRT both have DCT, GTS has Pirelli Corsa tires (Sport Cup equivalent).
As far as the regular M3, there are no published tests of the ZCP and/or DCT. Given the time of the GTS is the 7:48range and has HP advantages, DCT, and better-than-ZCP supension enhancements, ligher weight, an M3 ZCP + DCT may be able to shave a a couple secs off the 8:05 time which was MT and I believe was done on Cup+ tires.
It's also likely that the F80 M3, being lighter, around 450 hp, higher torque, but larger/less nimble, and have softer suspension (vs GTS, CRT), will probably have a low-to mid 7:50s nurburgring time, given what we already know about CRT/GTS performance.
Also the E92 M3 had the same Nurburgring time as the F10 M5 as recently tested by SportAuto at 8:05
Here's an interesting perspective of Nurburgring times:
http://rawautos.com/2012/02/uncooked...an-be-changed/