http://www.techradar.com/news/apple-tv-4k-vs-apple-tv-prices-specs-and-features-compared

Apple is finally joining the civilized world of 4K Ultra-HD with its new Apple TV 4K, a new streaming box that can output the higher resolution in conjunction with HDR and Dolby Vision. 

It’s something that probably should’ve happened back in 2015 when Apple announced the new-and-improved Apple TV, but hey, it’s better late than never.