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RankRanger noticed that not only are the video boxes dropping out of the search results, but also the image boxes. In fact, they noticed a 25% reduction in the number of times the image box shows up for their dataset in Google.
Their SERP tracking tool shows this drop off for image boxes in Google search:
This seemed to have happened around the November 15th update but that may be completely unrelated to this specific update and might just be a coincidence.
Forum discussion at Twitter.
