Grant:

Aha - so, you'll only keep GTS for a few months?  Do you have to pay VAT twice?

No, car will go to my business partner here in early 2016 when I get 991.2 

He wants 991.2 GTS but, he is not willing to pay price of new one. Therefor I ordered the car in his desired color and low specs (I just added -20mm). I will drive it until 991.2 arrives. It will be also a good thing to compare both generations directly.