Update: Google confirmed that this new look is rolling out to desktop searchers now.
It looks like Google is starting to roll out the new desktop search interface we saw them testing a month or so ago. It might be Google just bumping up the people who see the test, but I am now even able to replicate it across several browsers, with the exception of Safari.
Here is the new look, with the new boxier look and the tools and search features in the main area, under the search box:
Here are some fully screen views showing the Twitter carousels and People Also Search For and other search features, all more boxed in. You can click to enlarge any of these:
Are you seeing this new layout? I wouldn't be surprised if Google rolls this new user interface out soon.
Forum discussion at Twitter.