Not currently and unlikely to be rated for existing models with the exception of the 997.2 Turbo S.
Porsche GB have been playing hard ball with regards to warranty inspections. Given this, it is also unlikely that Porsche (albeit partnered with the tyre manufacturer), they will turn a blind eye to any car presented for inspection with non N rated MPSS as they have with other tyres in the past.
Knowing that I will need replacement tires for my 997.2 sometime this summer, and likely before the Porsche Parade in Savannah in August, I picked up a set while the rebate was in effect. The rebate just about offset the shipping cost of this purchase. They now sit in storage awaiting the right time for the change over. I also figured that supplies are now at their peak, and I didn't want to be caught out with a need to replace, in a short time frame, and my sizes back ordered at the critical time.
Installed a set of 18" in OEM size on my 05 Boxster S.
The only comment I can make so far is they look very good and the ride and noise level are superior to the PS2's they replaced. Hope to get them on the open road soon to see how they handle.
2015 Cayman GTS - Sapphire Blue Met., Platinum Satin Wheels, PDK, PTV,
2010 CS - Aqua Blue Metallic
2008 GT3 white
2004 40 year anniversary 911 GT silver
1999 911 black
1987 928s white and blue
1985 928 red