Sony confirmed this in a PlayStation Blog post.
The upcoming Grand Theft Auto game for PlayStation 5 consoles is going to be a whole new experience in terms of visuals. As the blog post on PlayStation Germany's website states, for those who haven't had enough of Los Santos, there's a new improved version of the gangster city coming up. According to Sony, with a 4K resolution and a 60fps frame rate, you will glide through the dangerous streets of Los Santos smoothly enjoying the juicy new graphics.
The blog post teases a few more 2021 releases for PS4 and PS5 which include Life is Strange: True Colors and Deathloop both scheduled for September, Battlefield 2042 and Ghostrunner coming in October, and some other games.