Google is testing a new reviews user experience from the local panel listing in the search results. Instead of popping up the reviews in a new window over the search results, Google is taking you to a reviews card summary.
I don’t think the reviews card summary is new, but it shows up when you click on the “reviews” link in the local panel, I do believe is new.
This was spotted by Nicolai Helling who posted this video on Mastodon:
Here is a larger screenshot of that screen:
Here is what you would generally see after you click on the “reviews.”
Forum discussion at Mastodon.