Bing is testing a new expandable news search card box. When you search for news related topics, Bing may or may not show you this new card.

It shows a box filled with news stories, with the option to expand the box. When you expand the box, it shows more news stories with a link to even show more stories directly in Bing News.

Here is a picture of it closed:

Here is how it looks when open:

Here is a video of it in action from Ruben:

Forum discussion on Twitter.