We are announcing support for AdWords API v201409 reports in AdWords scripts. The new version introduces PLACEHOLDER_REPORT, a new report type that allows for retrieval of extension stats.

If you use API versioning in your reports, then you need to modify your code to use v201409 as shown below. If you don’t use API versioning, no code changes are required.
var report = AdWordsApp.report(query, {
   apiVersion: 'v201409'
If you have any questions about this feature or AdWords Scripts in general, you can post them on our developer forum.