Shree Vaidya has spotted something new going on with Google, a new format for the sitelinks on the mobile search results.
Google Sitelinks are the links that are found under a search result snippet that adds additional navigation links to important and relevant pages on the corresponding site.
If you look at the picture below, you’ll see that you can expand a category of the site and then see subsections within the link:
In this case, when you expand on the SEO, four new links appear, including the the Google Algorithm Updates category.