If you look closely, you'll notice the display URL in Adwords ads are above the ad copy, not below. Ad copy also appears on the same line as the display URL in some cases.
I did a quick search in Google Blogs (search within only blogs) to see if anyone has blogged about this yet or may know what's going on. Over here in Vancouver, I still see the traditional ad display so all I can do is speculate that Google is shakin' things up and testing the impact of different ad structure.
Jason also observed that the text appears larger than usual which indicates Google may be testing out new formatting of not only paid search but also organic.
Of course it could be handywork of an internal prankster at Google, or the equivalent to Jason's computer trying to drive on the opposite side of the road while across the pond. (PS, if you're wondering what the stars are, that's a feature of StumbleUpon - you can see which pages have been reviewed and rated by Stumblers, and if one of your friends gave it a "thumb," that will show up too.)
Anyone have more information on this?