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Merkle spotted Google testing a new product / shopping ad listing format that adds filter buttons below the product carousel.
I tried to replicate it myself but I did not get the filter icons. As you can see in the screen shot shared by Merkle, you can see three filter bubbles including in store, top rated and up to $130.
Clicking on those filters will filter the products by any of those qualifiers.
Forum discussion at Google+.
