Apple has sent out a notice stating that submitting new apps and app updates in iTunes Connect will be unavailable from Tuesday, December 22 through Tuesday December 29, 2015.
Customers with existing apps will continue to receive content hosted by Mag+ or by their own hosted servers.
This shutdown will not affect the ability to build iOS apps in the Mag+ Publish portal nor to build Android/Kindle Fire apps.
Note: It is important to know that new app submissions and updates can take anywhere from 6 to 10 business days to review and approve. If you need to have your app live before the holidays you should submit it as soon as possible.
The busiest season on the App Store is almost here. Make sure your apps are up-to-date and ready for the winter holidays. New apps and app updates will not be accepted December 22-29, so any releases should be submitted, approved, and scheduled in advance. Other iTunes Connect functionality will remain available.
If you have any questions, contact us (http://www.apple.com/itunes/go/itunesconnect/contactus).
The App Store team