Apple has let their iOS developers know via iTunes Connect that iTunes Connect will in fact be closed December 23-28. Apple’s App Store app managment service will become available again on December 29th. This does not affect app consumers in anyway but will not allow developers to make changes to or submit any new apps during that time frame.
iTunes Connect will be temporarily unavailable from Thursday, December 23 through Tuesday, December 28 for the winter holidays. iTunes Connect access will be back online for use on December 29. If you choose to set an available date for your app to go live during the scheduled holiday shutdown, your app will not go live on the App Store until iTunes Connect resumes for business on December 29. Please plan your releases accordingly.
Apple notes that developers should be sure to plan their releases accordingly and we recommend that you developers shouldn’t try anything funny on December 22nd or something like that.