@tecnonetblog posted a video of new Bing deep links (aka sitelinks). The new format has 6 main top level deep links and then has up to an additional six or so sub-deep links under some of the main deep links.
Here is a picture from the video so you can see it clearly:
We also covered recently that Bing was testing deep links within the search box. So clearly Bing is doing a lot of user interface tests with their deep links.
Google has been doing some sub sitelinks as well in the past.
Here is the video of the new Bing sub deep links:
Forum discussion at Twitter.