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It's called Hard Fork.
Developers can also test “new iOS 9 features” in the new TestFlight.
Adding watchOS 2 to the TestFlight mix is also interesting. The new Apple Watch operating system allows for apps to be loaded onto the watch without the need for an iOS counterpart. As there’s no Apple Watch app for TestFlight, it seems the iPhone will still be the conduit for beta testing new apps there as well.
Additionally, the update lets users control notifications on a per-app basis, which is great if you’re testing multiple apps, or just don’t want to be bothered by one receiving a lot of updates.