Just got this;

iTunes Connect will be undergoing scheduled maintenance on Thursday, October 25 from 12 p.m. to 7 p.m. (Pacific).

During this time, iTunes Connect will still be available. However, pricing changes made, or scheduled to go live, between 12 p.m. and 7 p.m. (Pacific) will not be reflected on the App Store and your app will become unavailable for purchase for the duration of the maintenance period. When maintenance is complete, your app will become available. To avoid interruptions to the availability of your apps, we recommend that you do not make any app price changes during this time.