so you need them to say that for it to be justified!!!, ok then, they have never said that 970 GTX has segmented memory (they lied), they have never said you need 980 SLI or even 980 Ti SLI to play on 4k since they said 980 Ti is 4k card and is enough but they lied again, they have never said that G-Sync is just adaptive V-Sync over DisplayPort and its kind of DRM, oops lied again,........so you have it!!
however, 980 Ti is aimed for 4k which ended up a 1440p card, this one is faster than 980 Ti and also faster than 980 SLI which makes it a 4k card, according to marketing departments, they focus on the trends and new techs to spotlight it, last year it was the 4k thing, this year it is VR, it doesn't make sense to keep marketing the 4k thing every year, but i'm sure 4k will be listed somewhere in the specs.