Nikon did this in 2011 with the Nikon V1, here's your article http://www.eoshd.com/2013/03/nikon-v1-shooting-4k-60fps-raw-for-200/
It's a shame because Nikon does innovate but do nothing to improve. The D90 was the first DSLR to include video and @ 24p, Canon later released the 5Dii and the masses wanted manual control so Canon gave them manual control there wanted 24p as well as the 30p so Canon gave them 24p meanwhile there isn't even a Nikon APS-C capable of manual aperture.
I think you said the Nikon V1's sensor is capable of 4k raw. Nikon could easily open up these features but continues to limit them selfs... Their last mirrorless camera was the J5 with 4k @ 15fps...
Here's another example below of the V1