Google has been working hard in 2017. With the improvements in Search on mobile, Google continues to add flexibility by making Google AdWords extensions more powerful.
At a global rollout, the update to AdWords design is a major one as it makes sitelinks more interactive and tappable. This allows users to scroll further and click through deeper parts of a website.
While callouts and structured snippets also getting more attractive.
This new design matches the mobile design for organic sitelinks that Google pushed out a few weeks earlier.
The difference between these sitelinks snippets and those on regular websites is that they are not automated links.
While the latter uses Google Search's algorithms and structured data, the extension snippets are chosen directly by the advertiser.
Giving users the ability to view sitelinks should be an advantage to both Google Search users and advertisers.
As an added value, callout and structured snippet extensions that are shown underneath an ad, are included in line with the ad copy. According to Google, this would allow more of the callout and snippet text to be displayed. This is a huge update for sitelinks, as previous mobile versions would regularly see cut-off links.
In short, previous iteration wasn't at all interactive.
Google has been testing callouts and structured snippets in various swipable formats. The update combines them in to the advertisements themselves to form unity in viewers' standpoint.
As of the announcement, Google has reported that users are twice as likely to interact with the new site links format, aided by clickthrough options that allow users to scroll side to side.