"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
Apple Seeds Fourth macOS Sierra 10.12.2 Beta to Developers [Updated]
macOS Sierra 10.12.2 beta 4 is available for download through the Apple Developer Center or through the software update mechanism in the Mac App Store.
macOS Sierra 10.12.2 includes new emoji, introducing Unicode 9 characters like clown face, selfie, face palm, fox face, owl, shark, butterfly, avocado, pancakes, croissant, bacon and more, plus many profession emoji are available in both male and female genders. Apple has also updated the artwork on many existing emoji, adding detail and design elements to make them look less cartoonish and more realistic.
There are few other outward-facing changes aside from the addition of new emoji, but the 10.12.2 update also likely includes many bug fixes and performance enhancements to address issues that have surfaced since the release of macOS Sierra 10.12.1.
Available since September, macOS Sierra is the latest Mac operating system. It includes Siri support, Apple Pay for the web, Universal Clipboard, Apple Watch auto unlocking, improved iCloud Drive integration, Picture-in-Picture multitasking, and dozens of smaller features that can be found in our macOS Sierra roundup.
Update: macOS Sierra 10.12.2 beta 4 is also available for public beta testers.