Seems to me Nvidia is trying to promote the Pascal Titan X as a semi-professional card. From the GeForce website
"TITAN-series graphics cards are the embodiment of perfection, utilizing each generation’s ultimate GPU, the fastest VRAM available, the best components, and the most desirable shrouds. Since 2013 TITAN-series graphics cards have broken records, turned heads, and delivered supercomputer performance and capabilities to gamers, engineers, medical professionals, and scientists around the world. Today, we unleash
NVIDIA TITAN X, the ultimate TITAN, powered by Pascal, the world’s fastest and most advanced architecture."
Of course they also want gamers to buy them. I think the way Nvidia releases the Titans before the strictly gaming version of the Flagship GPU of the series is because they can scoop up a few gamers with fat wallets and perhaps a shortage of self control to wait on the 1080 Ti version. If you actually need 12 GB VRAM for some reason then I guess the Pascal Titan X is for you if you want the best performance out there.
Nvidia is following a similar pattern since the Kepler Titan release. It was seven months later that we got the GTX 780 which was a gimped GK110 and two months later we got the GTX 780 Ti which was faster than the Titan until the Titan Black released three months after that and they were the same unless you needed the 6 GB VRAM on the Titan Black at that time.
Then the Maxwell Titan X released about a year and a half ago. The GTX 980 Ti followed three months later. The non reference 980 Ti was about as fast as the reference Titan X and a heck of a lot cheaper to. $675 compared to $1,100 for the Titan X.
Wash/ rinse/ repeat. The Pascal Titan X is $1,200 and there is no doubt in my mind that the 1080 Ti will come. It's just a matter of time and a little patience. My guestimate is that Nvidia will set the MSRP at somewhere around $800.