A picture of what is claimed to be the first look at the PlayStation 5's user interface has been posted on a well-known imageboard. The poster of the image states that they work at a game studio that is currently utilizing PS5 devkits. Comments in regard to the possible PS5 UI have focused on its similarity to the PS4's revamped UI.
https://www.notebookcheck.net/First-glimpse-at-potential-PlayStation-5-user-interface-shows-similarity-with-PS4-s-UI.451020.0.html