There is a general misconception going around the internet that the upcoming (and inevitable) PlayStation 4K will merely be an upgrade to allow 4K media playing and carry the same GPU specs. That would be cool except the PS4 can already do that.
Back when PS4 was first announced questions arose whether games will output to 4K. Sony’s PlayStation Shuhei Yoshida responded with the following statement to IGN:
The PS4 supports 4K output, but only for photos and videos; not games. PS4 games do not work on 4K.
So there you have it. Also the fact that Sony is keeping mum on the rumors of a new PlayStation 4 with stronger GPU capabilities pretty much guarantees that we WILL be getting an upgraded version sometime this year.