We strongly recommend that you do not schedule any pricing changes in iTunes Connect that would take effect between Friday, December 21, 2012 and Friday, December 28, 2012. Pricing changes scheduled to take effect during this date range will not be reflected on the App Store and your app or In-App Purchase will become unavailable for purchase until after the shutdown.
If I attempt to change the price right now, will it go into effect now and my app will be available at that new price during the shut down, or will it go into effect after the shut down and my app will be unavailable until the shut down ends?
I hadn't realized price changes weren't allowed during the shut down until just now... I'd planned to change prices for just a subset of the shut down, otherwise I would have changed them yesterday just to stay on the safe side :-/