Apple today seeded an all-new round of betas for developers, including iOS 10.1, macOS 10.12.1 Sierra, watchOS 3.1, and tvOS 10.0.1. According to the version numbers, they should all be minor updates except for tvOS, which would be a bug fix/security update.
Of the four updates, the one that was promised was iOS 10.1. When Apple announced the iPhone 7 Plus, the company promised a Portrait Mode - which would create changes in depth of field for the camera - that would be coming in an update this fall.
Indeed, Portrait Mode is now available in the iOS 10.1 beta. But now for the bad news. In case you were hoping for Unicode 9 emoji, it's still not present, although Apple could always add it in a future build. Until then, no bacon emoji for you.
The macOS 10.12.1 Sierra build number is 16B2327e, which is a jump from the GM seed, 16A320. The release notes don't say anything about what's new.
In fact, tvOS 10.0.1 is the only one with release notes that actually say what's new, and it only says that it includes bug fixes and improvements. Also, this was the only update that we were unable to install. The update fails and suggests that we restart the Apple TV.
There is also a new Developer Beta for Xcode 8.1, which is normal for any time Apple pushes out significant OS updates. It usually just includes updates APIs for whatever new features were implemented in the OS.
There are no Public Beta builds yet for iOS 10.1 or macOS 10.12.1 Sierra, but we'll let you know when there is.