Apple will be commencing its annual iTunes Connect shutdown on Saturday, December 21st this year. The shutdown will run until Friday, December 27th. During this time developers will not be able to submit app updates or price changes in the iOS and Mac App Stores. Apple announced the dates for this year's holiday shutdown in an email to developers late last week:
iTunes Connect will be temporarily unavailable from Saturday, December 21, to Friday, December 27, 2013.
During that time, iTunes Connect will not be accessible and you will not be able to submit any apps or In-App Purchases. Processing of any Newsstand Atom feeds will be delayed until after December 27. Sales and Trends reports via the Autoingestion tool will