Even though we are only experimenting with 4K resolutions, on TVs and cameras alike, Japan Broadcasting Corporation, known otherwise as NHK, has finished developing the specification describing the incarnation of TV broadcasts that will come after it.
That is to say, while its recommendation for Ultra High-Definition TV (UHDTV) did include 4K resolution information, the primary matter was Super Hi-Vision 7680 x 4320 8K video.
That said, after going through the information and pronouncing the 8K standard adequate, the International Telecommunication Union did not even mention 4K in its announcement.
For those interested in how Super Hi-Vision works, the TV broadcast standard defines Ultra High-Definition Wide-Screen System with 4000 Scanning Lines and a frame rate of 120 FPS.
NHK Science worked together with Technical Research Laboratories on the draft recommendation.
The 7680 x 4320 pixels resolution is 16 times higher than standard Hi-Vision HDTV systems. It is also paired with a 3D audio system made up of 24 loudspeakers.