4K vs 1080P

Right now the tech seems like develop too fast, some of the contents cant really catch up revolution with the growth speed. Most TV and some monitors is now telling they are up to 4K, but what about the contents? are they being upgrade as well? when we have good gears 4K tv, but our contents is still using 1080P, it will only make the images blur and ugly.

But when talk about the gaming, Assassins creed 4 blackflag is now can being played with 4K resolution!