There is an embarrassing lack of the newest Sony and Microsoft consoles NOT being able to render games in 4K. See Forbes article . This is also a silence from both companies as to when they might fulfill their promises to make 4K happen. Some even understandably suggest 4K on these two consoles is not even mathematically or physically possible with the given hardware.
Yet 4K (and UHD variant) TVs are quickly taking a bigger part of the market. Add to this the likelihood that if you hook up a PS4 (or XBOX One) to a 4K TV you will have a frustrating lag while the TV attempts to upscale your game content to 4K resolution. It will be important to you in the near future (if it is not already). So be careful before upgrading to that sweet new UHD TV you've been salivating over... it may just kill your gaming joy.
Yet there is that there will be truly 4K capable PS4 consoles this year. But that's just a guess.