David Iwanow shared with me on Twitter a new feature from Bing that shows a new search result snippet box named "popular content." It looks like an expanded and more visual version of sitelinks in the search results. The weird part, this is in addition to the search snippet having site links.
Here are some examples from @davidiwanow and @glenngabe:
I am able to replicate both of these examples.
Forum discussion at Twitter.