Apple readies its 4K movie catalog for Apple TV pre-orders
 

If you're sweet on the latest Apple TV, you're probably also planning on stocking up on 4K downloads. After all, the bump in pixels is its biggest draw. And, if you head to iTunes right now, you'll see that a bunch of content is available in 4K HDR....

https://www.engadget.com/2017/09/15/apple-tv-4k-itunes/