Apple is now allowing developers to test more iOS 9 features with an update to its beta distribution app TestFlight. The updated version enables developers to test faster, native watchOS 2 apps for Apple Watch, including newly gained access to more sensors and custom watch face complications. The update also lets developers test some iOS 9 features like App Thinning, which allows users to download larger chunks of apps as needed to preserve local storage, for the first time.

Apple highlights the added support for iOS 9 app distribution in the latest version of its TestFlight app for iPhone, iPad, and iPod touch. Apple has also added app-specific notification support in the new TestFlight update:

Developers and testers can update to the latest version of TestFlight for iOS via the App Store. While the update adds support for iOS 9 features and watchOS 2 apps, testing is still be limited to smaller, internal groups and not external test groups yet. Both iOS 9 and watchOS 2 are due out for iPhone, iPad, iPod touch, and Apple Watch later this fall.

What’s New in Version 1.2.0

This update adds support for testing upcoming iOS 9 features — including watchOS 2 apps and App Thinning.

Testers can now choose how to receive update notifications for each app they are testing. Also, watchOS 2 beta apps will install automatically when the “Automatic Downloads” setting is turned on in the Apple Watch app.

Minor stability and performance improvements.

Update: Apple has sent developers an email which clarifies that today’s TestFlight update does not yet extend to support external test groups; developer testing has also produced in this conclusion.