Well I do not think it would be out of the ordinary for 4K support to come at some degree for the PS4 (though I doubt there will be native 4K support). It is important to note that a switch to 4K would cause an icrease in game developement costs and perhaps on game prices (something which occured during the HD switch). Furthermore, high-end graphic cards are only beginning to support 4k (although specialized graphic cards have been supporting it for video playback for a while) and the display technology is still too expensive. So can Sony work 4K into the PS4? I think they can, but it will be all around expensive. Is it worth doing it? No, because it is too early, and I do not think Sony in the state that it is right now should take such a gamble.
As far as Nintendo getting criticized for Wii U's ability to do 1080P, I think that people are just skeptical the Wii U is the first system to do HD graphics (something Nintendo did not care to do in the past), and there was a little miscommunication at E3. It appears that Nintendo's own games (like NSMBU and Pikmin 3) were running at 720P, whereas third-party games (like Batman Arkham City and Assassins Creed III) were running in 1080P.







