Re: No 4King way.
because right now 4k is pointless. Apple have a long history of supporting only useful new technologies which work as required. Any 4k content you could actually access by streaming will be so compressed as to be no better than scaled up 1080 content anyway, which your 4k tv could probably do itself. Most of the world don't have the bandwidth to stream 4k either, and finally they needed the hardware to be cost effective.
I'm not saying it's better off without it, but I agree with their decision to leave it for the future and concentrate on other things for now.