Google is testing a new AdSense ad format. The new format has a whiter and cleaner feel, with blue circle enclosed arrows, with hover over animations that expand the ad. The old format had block arrows, with less animation and sometimes the blocks were in blue or gray.
I am not sure if this is a new test or if Google is rolling this out to publishers now. In any event, I was able to create a video of it in action. We've seen Google test animated AdSense ads twice before.
Here it is:
Here is a screen shot of the block ad unit side by side, new versus old:
Do you like this new format?
Forum discussion at WebmasterWorld.