Mark Gurman and Anousha Sakoui for Bloomberg:
"Apple is planning to unveil a renewed focus on the living room with an upgraded Apple TV set-top box that can stream 4K video and highlight live television content such as news and sports, according to people familiar with the matter."
For the average person, 4k is overrated. Not only is there a lack of content, given how most people situate their living rooms, they'll be sitting too far away to truly take advantage of 4K.
"The new box will also be able to play content optimized for TVs capable of playing High Dynamic Range (HDR) video, which produces more accurate colors and a brighter picture."
HDR is definitely the future of display technology. From TVs, to phones, to computer monitors, it'll soon be considered standard.