Google are announcing a new feature that will allow Google Apps admins to automatically notify their users of any newly installed app from Google Apps Marketplace. After installing a Marketplace app from the Admin console, admins will have an opportunity to choose whether to send a notification to their users to inform them about the newly available app:
The notification will only appear to the people in the OU or domain for which the app has been installed. The notification will appear in each person’s Notification Center and will describe how to access and launch the app:
Note that for domains not currently using Google+ and potentially unfamiliar with this kind of notification, the Notification Center icon will appear in the Google One Bar whether admins opt to utilize the post-install notification feature or not. This area will be used for notifications from other Google Apps moving forward, so admins may want to inform their users of this UI change in advance of this launch.
This new feature will be gradually rolled out to all domains.