Apple today posted another GM seed for macOS 10.12 Sierra in the Developer center. The new build is 16A323, which is a bump from last week's 16A320.
Obviously, there's not a lot that's new here. This is the second GM seed, which means that the company likely found a couple of bugs that it wanted to squash before the public release, which is less than a week away.
macOS Sierra is the next major update to OS X, and it contains a number of new features, the most notable of which is Siri. You'll also be able to unlock your Mac with your Apple Watch, assuming that you have two-factor authentication turned on in your Apple account. Users will get other features that bring macOS on par with iOS, such as picture-in-picture video and photos that organize themselves by people, places, and things.
For the first time since OS X 10.8 Mountain Lion, Apple has ended support for certain Macs. If you're not sure whether your PC will be supported, check out our list.