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I've had this problem for years, and I think it's because I often switch my apple account between countries. The update notifications and the updates themselves come through on two different channels, which are usually out of sync.

1. One app will think my account is "in" the U.S., sends me to the App Store for an update. 2. App Store checks and sees that, oh, nope, this is a German account, but maybe try back in few days.

Guesses?

They encountered a problem, or the teams doing the updates are out of sync. Or they're scrambling to get it out due to some caching problem. Who knows really any number of things could be going wrong.

Apple always does updates in batches to help server load as well as minimize the affect of any issues that happen whenever the update goes live.