In an email sent to developers earlier today, Apple has confirmed that iTunes Connect — the developer portal to manage applications to sell in the App Store — will be closed from December 21 to December 28. During the shutdown, access to iTunes Connect and delivery of any apps or updates will not be available.
iTunes Connect will be temporarily shut down from Friday, December 21, 2012 to Friday, December 28, 2012, for the winter holidays.
Additionally, the following will be delayed:
Releases scheduled to appear on the App Store for the first time
Pricing changes scheduled through the interval pricing system in iTunes Connect
For the shutdown period, Apple suggest developers to not schedule price changes that would take effect between Friday, December 21 and Friday, December 28. According to Apple, price changes scheduled for the shutdown week will not take effect, and "In-App Purchase will become unavailable for purchase until after the shutdown".
Last year, Apple shut down iTunes Connect for developer from December 22 to December 29.