Why you people must contradict yourself so plainly?
"Ultra" texture are NOT what the PS4 runs at. We are looking at high. If they wanted they could easily push in some insane resolutions to the point that not even 10Gb will be enough. So what? Not even 3 or 4 Gb will be enough in a few years. It's not like the resolution of a texture requires a lot more work for an artist.
We have to agree on what "next gen" means, because if we consider Xbox one and PS4 the canon of next-gen, then we still have to prove that on PC more than 2Gb is need (on same settings).
I mean "next gen" (with quotes) not only PS4/XB1 level (High) but "next gen games on PC with highest texture quality". In this game = Ultra.