When you install a new app from the App Store in iOS 6 (coming fall 2012) there is a new blue banner that appears in the top right corner of each icon. This makes it easier to find if you’re like me and have hundreds of apps. Once you open an app for the first time the banner goes away.
Cool feature! New banner could also be used to highlight apps which haven’t been used in X days and are ready for culling or dual highlight apps wich have an update
How to manually remove it? Apple should give us an option to disable that .