Apple Adds 'Offers In-App Purchases' Warning For App Store Apps
“The new tagline is currently only appearing in the desktop version of the App Store that sits within iTunes. For now, it's not shown in the iOS App Store app, nor does it appear on webpages for iOS apps”.
Apple recently settled a suit filed in 2011 after children spend hundreds of dollars making unauthorized in-app purchases in supposedly free games.
The report also notes that Apple could use the new feature to deploy a filter allowing parents to restricts downloads of their children to only free apps without In-App Purchase content.