A DigitalPoint Forums thread reports spotting new Google AdSense units being tested. It appears Google is mixing a typical text ad unit with what are called link units.
Here is a screen capture taken from the forum thread: Google AdSense Link & Text Ad Unit Mixed. Notice the links at the bottom of the ad. You can click on the image or go to the thread to see a full size version. These ads are also being tested on other ad formats, as you can see on page two of the thread. I was unable to reproduce the ads, but they seem to be real.
Forum discussion at DigitalPoint Forums.