The manner in which Google's mobile search ads show sitelinks, callouts and structured snippets is changing - and really, in quite dramatic fashion.
Sitelinks, for example, which enable advertisers to send consumers to a specific page on their website directly from the ad, will now be shown using both horizontal buttons and larger vertical links (see image below). Google is claiming that users are twice as likely to interact with Sitelinks in this new format.
Google is also making a change to the way that it displays callouts and snippets on mobile search result in order to make them more readable.
Previously, both of these extensions appeared in a separate line below an ad but now they will appear "in-line" with ad copy in paragraph form (similar to how both area handled on desktop).