Apple TV upscale Sling Tv

Sling TV streams most live programs in 720p. Apple TV 4K will not change that. It will be scaled to fill a 4K screen of course, as the output will be according to device settings. That scaling will be done by Apple TV, to its best real-time ability, but will not result in 4K details like 4K footage has.

think all tvs auto upscale really even if you connect an old 1980's console to a new tv then it would display on all of the tv screen which would mean it upscales, upscaling can't really add new information to the visual stream