http://www.techradar.com/news/imminent-release-of-apple-tv-4k-sees-ultra-hd-movies-appearing-on-itunes >Having a set-top box that can output to 4K TVs is great, but it's pretty useless without some 4K content to play on it.  >Apple is beginning to take care of that latter point today with the rollout of 4K movies on iTunes alongside the opening of pre-orders for the Apple TV 4K.