Google is testing yet another user interface variation for the people also search for function in the search results. This new test is showing rounded corners for the button. Here is a screen shot shared by Sean Bucher on Twitter:

Here it is zoomed in or you can click on the image above to enlarge:

Google has tested tons of variations around this feature, from dynamic loading, to a carousel slider, in the news, back button variation and more.

Forum discussion at Twitter.