Personally, this is often one of the most interesting bits about a new console, partially because the concept of a "UI" in general was so novel to me as far back as playing CDs on the original PSX but has more and more really come to define what a person's experience with a console is like.
My first thought: there's a lot of XBox in this! Sony seems to have pulled back from their more distinctive, blue and white aesthetic in favor of XBox's more muted, soft look. I wonder why both companies are favoring this look? Personally, I find it a little bland.
Anyway, some pretty interesting stuff in here that could have much broader ramifications than we can really know at this moment...or just kind of fall by the wayside as first party implementations of third party functions have tended to in the past. The most interesting one for me was the pairing of an estimated time remaining for given achievements/"activities" in a game as well as developer-curated screenshot/video guides for PS+ users. The latter seems like it could be a real game changer, but I feel like XBox marketed similar things in the run-up to the Series X and I never hear owners of that console talk about how they never use Polygon guides or watch Youtube videos anymore.