Some Google AdSense publishers are reporting seeing AdSense ad units without the URL and fav icon displaying.
Folks at WebmasterWorld have reported this saying Google is testing an ad unit that removes the URL and icon.
A typical AdSense unit may look like this:
But the reports say Google is testing only showing the title, description and arrow in the ad unit.
AdSense is constantly testing different style ads to see how it impacts click through rates and visibility.
I do not yet have a screen shot of this in action, if you have any, please add it to the comments below.
Forum discussion at WebmasterWorld.