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Here is an interesting test, spotted by Maulik Panchal on Twitter of Google testing a new format for their shopping ads in search. When you click on them or the show more button, it pops up an overlay on top of the search results with more shopping results.
Here is a screen shot from Maulik:
This was triggered in India and I cannot replicate it. I personally see a carousel like interface.
Forum discussion at Twitter.
