Bing is apparently testing showing deep links, what Google calls sitelinks, directly in the Bing search box, without going to the search results page.
Aaron Wall spotted this and posted a picture on Twitter. He wrote, "that is a drop down sitemap on brand queries right from the homepage search box (no SERP page)."
Here is a picture from Aaron:
I personally do not see this nor do I see deep links for this query in the actual search results page. This is what I see:
I kind of like it and it goes with the Windows boxy look.
Forum discussion at Twitter.
This story was scheduled to be posted today and was not written today, as I am offline today.