Not a fan of that cards-based design, too much scrolling left and right, there's simply too many of them while providing meaningless stuff. Plus sometimes they are on top, sometimes on the bottom, sometimes in the middle, it's a mess very similar to XB1 initial UI with tiles being all over the place. That being said, I don't think many 3rd party developers will actually utilize all those features, meaning there probably will be very few of those cards in games other than Sony's 1st party titles.
Love the ability to stream your friends gameplay in PiP mode tho, CoD Zombies came to mind immediately. Love that initial animated black/golden background as well, reminds me a lot of PS3's XMB which was simply the best, god I wish they brought it back in full 4K HDR glory.
Hopefully there will be another UI walkthrough in the near future, because this one didn't show mych to be honest - still no BC info, still no info if there's a QR-equivalent feature, we saw D:AS loading in around 10-11s but that's it, personally I'd love to also see the games downloads, if they have improved compared to PS3/4 due to PS Store being built into the system, or is it the same garbage and the internet will be flooded with "why my PS5 downloads are so slow??" threads after November... So as usual, Sony gives us just a glimpse, teases us, and then leaves with many unanswered questions. But luckily within a month YT will be filled with user-generated content and nothing will be left unspoken.