Rounded search bar being tested on Google's mobile site
Additionally, the headings under the search bar (All, Images, Videos, News, Maps, Books) are no longer hemmed in by lines on top, bottom and on both sides. The change to the search bar that makes it more rounded at the ends matches the look used by Google on the Pixel Launcher.
By the way, in case you were wondering, the test site was discovered in Sweden. So far there is no word from Google on when, or if, this change might become official.