Google seems to be testing a new interface for its homepage. I just spotted it on Google UK, and only when logged in and using Chrome. Also, it’s only available for some users, as usual with these kinds of experiments. This is what it looks like:
The content is no longer centered, but instead aligned to the left, and the left sidebar is styled differently, with different colors and icons. The header and search box have a grey background that clearly separates them from the search results. As far as these are concerned, the only visible change seems to be that the site URL appears right under the search result link, instead of after the site blurb.
Here’s the old interface, for comparison:
Note that the new-ish black menu bar is already on both versions.