Treyarch released their PS3 graphics patch three days from launch which resolved the shitty, blurry graphics. Given next gen is less than a week away, I think it's highly unlikely they'll bother dumping resources into a version the minority are playing. There hasn't been more than 250,000 players online for PS3, so I think it's pretty clear folks are waiting for next gen. For comparison, launch day on PS3 blops II had 800,000+ players online.
Judging by the screens
here, the next gen versions look clear and you can actually make things out. Mind you that's the xbone version which is native 720p, the PS4 version is native 1080p.