Apple this week announced their annual holiday shutdown of iTunes Connect will take place between December 23 and December 27. This means there will be no new apps uploaded to the App Store during the Christmas weekend. Here is the official announcement from Apple:
"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 23 to 27 (Pacific Time), so any releases should be submitted, approved, and scheduled in advance. Other iTunes Connect and developer account features will remain available."