John Lincoln @johnelincoln shared a photo with me of a new style for Sitelinks in the mobile results. They look like the people also search for blocks we covered some time ago, but now they are used for Sitelinks.
Instead of just basic blue hyperlinks below the snippet, Google is showing the sitelinks in boxes that can be swiped left and right, in a carousel form.
Here are pictures from John showing them in the organic and ads:
Google is always testing new things but honestly, the card style format tests keep expanding and expanding. We may be seeing a roll out of it soon - I think.
Forum discussion at Twitter.