Non-Newsstand apps : When the publisher clicks the Notify button to indicate a new or updated folio, users see the red badge on the app icon.
Newsstand apps : When the publisher clicks the Notify button to indicate a new or updated folio, only subscribers to the app see a red badge on the Newsstand icon that indicates the number of folios downloaded in the background. A blue “New” sash appears on the app cover in Newsstand until the subscriber opens the app. For both subscribers and non-subscribers, the cover image is updated to reflect the newest folio cover. Push notifications are required for Newsstand apps.
Thank you for your quick response.