Several days ago, Apple released the development guidelines for its Apple store. Recently, Apple has quietly begun removing the App Store "squatters" – apps that have been reserved, but no subsequent binary has been uploaded.
Actually, the issue of app store “squatters” was brought up over a year ago, it wasn’t implemented until recently that Apple began restricting the name reservation process. Apple has begun emailing developers if they've failed to upload their binary for 90 days after first starting the app creation process. Apple warns the developer that they have another 30 days to do so, or the record will be deleted from iTunes Connect. And the key point: "The app name will then be available for another developer to use."