either the youtube video is horribly encoded or the detail levels on the zombies is really bad.
The author of the video is going a bit too far like he is giving away what he has been told to say. He is talking as if 4k is something new and there is no high visual platform already out there, well there is and its the PC.
It is funny because in the past, journalists would talk about console versions of games, and make side comments that are vague like "enhanced visuals" on pc, but never go into detail about it. Then when a console gets an upgrade everyone goes crazy.
The game itself looks interesting, glad its not first person view, however will it have solid performance or be a frame rate dipper.