All customers now have access to the new Popularity test, which analyzes the approximate popularity of a website and its competitors. We also graph this data over time.
The new test is found under Marketing, and will appear when you next re-run your report (unless you have a custom report layout).
As with the new Facebook and Twitter tests, this test is much more interesting once you define some competitors. You can do this under Settings > Site Settings, in the Comparison websites box.
As always, you can see what we’re working on next on our public roadmap.