An email has started going out to Google AdWords advertisers about a change to privilege access in AdWords. The email basically says that the "report-only" access is changing to "read-only" access.
Here is a block of the email that went out to advertisers.
We're going to replace reports-only access with a new read-only access. In your account, all reports-only users will become read-only users automatically. This change will allow your reports-only users to have a more complete view of your account's performance. Read-only users will have access to advanced reporting tools, available in the Campaigns tab -- for example filters and data segmentation, and this will make it easier to notice performance trends and find areas for improvement.
Read-only access will still be limited to browsing and viewing reports. These read-only users will not be able to make edits to campaigns, but they won't be restricted only to using the Reports tab. They'll be able to view statistics anywhere in your account, including the Campaigns tab.
These changes will be made in the next few weeks. No action is required on your part, if you're comfortable with the changes. If you don't want your reports-only users to see the Campaigns tab, you can update your account access preferences...
Forum discussion at WebmasterWorld.