Often, when searchers use Google, they see a box with a heading named “people also search for,” and then some additional search phrases that expand into additional search results. We reported about it a few times here, most recently in April 2015.
Now, Google is testing a new look for that on the mobile search interface. The new look is cleaner and more boxed-in. It also scrolls left and right, like many of the Google carousel features in mobile.
Here is an animated GIF based on some of the screen shots shared by @MattNavarra:
Google is constantly testing new interfaces, so this should come as no surprise.