When I got them I had an ROG Swift, but when I got my current screen I already knew that Maxwell V2 was not geared for DX12 or 4k. Just the nature of the hobby.
Yea the upgraded PS4 will have updated parts for 4k support in certain elements like GUI and media playback. I doubt they're really upgrading the base hardware because even though we're on the brink of new architectures I don't think they're ready for that kind of mass production on the RAM side.