Google AdWords is testing AdWords based cards in a carousel format in the mobile search results. So when you see an ad, under the snippet is a carousel of cards that you can swipe to left. In the example below, it contains Airbnb listings with the type, price and description.

Here is the test as provided by @conradoconnell on Twitter:

Here is what I see, just a straight listing under the snippet:

In the test above, you can scroll to the right to see more listings.

Forum discussion at Twitter.