Apple TV might get 4K video streaming, but it'll still lag behind

Big things could be coming to the Apple TV.
Last revamped in late 2015 with beefier hardware, a refreshed tvOS interface and the Siri Remote, Apple's set-top box has basically languished as competing set-top boxes like the Amazon Fire TV, Roku Ultra and the new NVIDIA Shield TV run circles around it.
That could soon change. Apple is reportedly testing a new Apple TV capable of streaming 4K video with "more vivid colors (sounds like HDR), according to Bloomberg. The current Apple TV only outputs