With the introduction of Enhanced Campaigns, sitelinks are getting an entire revamp. The following are several updates to sitelinks within Google AdWords to increase advertiser performance.
Ad schedule sitelinks for a specific time of day. For example, if your office is only open from 9AM to 5PM, you can enable click-to-call extensions to show only during those hours. In addition, you can create sitelinks specific to mobile devices.
Sitelinks will be able to be implemented at the ad group level; previously it was at the campaign level. This will allow advertisers to create more relevant, specific text links to send traffic to. With legacy campaigns, all sitelinks would be rotated throughout all of the ad groups within the campaign.
Reporting for sitelinks will be at the individual link level, instead of at the campaign level. Find out which specific link is receiving the most clicks and conversions.
The character limit is being reduced from 35 to 25.