That NVIDIA has the ability to release a gaming version of the P100 but they won't. I think in reality the difference in die size between GP102 and P100 simply comes down to transistors that would not benefit gaming applications in the least. I have no doubt that there will be a GP100, but it's not going to be what people expect it to be ("full" P100 die with HBM2). 780 Ti to Mitan X was only around a 30% gain. Mitan X to Pitan X is around 70%. I saw a 65% increase, myself, in Rise of the Tomb Raider using the same settings.