A number of these differences are visible on the mobile site's page view, with the tested version armed with the G color logo emblazoned on the left of the new search bar, and the search icon is no longer in the blue box.
In addition, the search bar header section consisting of All, Images, Videos, News, Maps and Books, is no longer adorned by a similar line of frames on both sides and the underside. This search bar change makes it more rounded on both sides and matches the look Google uses in Pixel Launcher.
For information, testing a mobile site with a new search bar found in Sweden. But until now, Google is still reluctant to give an official statement related to the change, or information related to the official launch time.