Google has been testing a version of its search results pages for quite some time, which show the search filters at the top of the results, rather than on the left. Here's what the test looks like:
And a zoomed out version to show the white space:
As opposed to the old version:
TechCrunch reports that a lot of people are suddenly seeing it today, indicating that Google has apparently increased the test size, or is rolling it out as an actual change. Some users are still not seeing the new version.
We've reached out to Google to determine whether it's still a test or not, and will update accordingly.