Google AdWords has updated a new update without the announcement.
Recently Google announced that sitelinks will be shown as a caroussel on mobile devices. Last week, Google updated their support pages for sitelinks and stated that 2-6 sitelinks can be shown on desktop and up to 8 sitelinks can be shown on mobile devices (in a caroussel).
This means you can add much more relevant information to your ads. If users are using the 8 sitelinks is not know, but you should be able to analyze this in the new Google interface.