Apple has today seeded the second beta of watchOS 3. We see this update three weeks after the last one. Other than some minor bug fixes and performance improvements, we see the new SOS feature. Apple talked about this back at WWDC. If you hold the Dock button on the side (the long one), it’ll call 911 for you and also alert your contacts.
To get this beta, developers can download it from the Apple Watch app under General. If you don’t have it yet, you can download the profile from the Apple Developer Center.