Beta App Review
Following the TestFlight acquisition a few months ago, Apple announced at WWDC yesterday that they will allow beta app distribution through the App Store in the future.
Overall, the program looks great, with developers being allowed to invite up to 1,000 beta testers per app and testing privileges being bound to usersʼ Apple IDs instead of specific iOS devices.
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So it seems that your beta app has to go through review at least once, but thereafter Apple may allow you to skip the review unless you make significant changes (whatever that means).