Apple seeds third public beta of macOS 10.12.1, new watchOS and tvOS developer betas

The new Sierra beta follows yesterday's developer seed, and comes a week after the second public beta. While the 10.2.1 update is primarily concentrated on bugfixes and speed improvements, it also upgrades the Photos app with support for iOS 10.1's Portrait mode, allowing those images to be organized into albums. Users can download the new code through the Mac App Store if they're a member of Apple's Beta Software Program.

watchOS 3.1 and tvOS 10.0.1 are simply maintenance updates. Their betas can be more complex to install though, requiring registered developers to use the Apple Watch iOS app or a USB cable respectively, though after installing a special profile tvOS betas can be downloaded over-the-air on an Apple TV.

It's uncertain when Apple will release the finished versions of all three updates, but Apple is rumored to be launching its touch bar-equipped MacBook Pro in late October, which macOS 10.12.1 might be geared to support.