Google AdWords quietly announced on Google+ the addition of a new report type named ad group details reports.
This is to expand on the campaign details reports they launched last month but now to do this on the ad group level.
Google says this will "help you find more granular information about the features and settings enabled in each of your ad groups."
You can now see details such as the number of sitelinks that are active or disapproved and if you you have mobile bid adjustments enabled within your ad group details reports. You can sort, filter and add additional performance columns to these new reports.
You can access these new reports under the Dimensions tab in the AdWords console.
Forum discussion at Google+.