The fifth developer beta of macOS 10.12 Sierra. The latest release is available now through the Mac App Store for developers. If you’re just starting to test macOS Sierra with this beta, you can find a promo code for the download via Apple’s developer website.
The headlining feature of macOS Sierra is support for Siri, while a variety of other enhancements are also coming. For instance, Auto Unlock allows lets Apple Watch users skip the password login screen. Additionally, Apple Pay is coming to Safari with the launch of Sierra, although that feature has not yet launched in beta yet.