Google is constantly testing some new features for its SERPs. The latest one is about site links.
They are testing a format for its Sitelinks for both organic results and search ads, which will show the Sitelinks in a vertical format that goes from the top down.
This is how it looks like;
Expandable links would be useful, hope it will be hidden by default. Btw a Really nice touch for looking for company info. However, no idea about product ads, it will definitely change some consumption habits and shopping experiences.
What is your comment on this matter?