As it does every year, Apple today announced that the iTunes Connect partially unavailable from December 23 to 27.
During this period, developers will not be able to launch new applications / games on the App Store, nor publish updates from existing ones. Everything must be sent, approved and scheduled before 12/23.
For users, in practice it means just a week off from new apps / updates. Good to make the most of the best of Christmas. 😉