Winston, when You put down the Apple IOS operating system on that list I did a Wikipedia search.

I think that if Apple has the I-Phone,I-Pad and Ipod Touch, then UltraFlix will surely be on their new 4k Television's.

Plain common sense "thinking" on My Part..

https://en.wikipedia.org/wiki/IOS

This is a very comprehensive List.

Thank You Very Much.