On this day, Apple has released for members of the Apple developer program a second beta of IOS 10.2 and a second beta of what would be the third major update for Sierra macOS. At a glance, these updates appear to be routine so no major changes are expected.
The 10.2.1 beta 2 (build 14D 15) and beta2 macOS Sierra 10.12.3 (build 16D17a) iOS operating systems are now available to install directly via Settings -> General -> Software Update on iOS devices and the Updates tab of the Mac App Store on Mac.
The latest betas are also available for download through the Apple Developer Center. The IOS 10.2 and 10.12.3 Sierra macOS versions soon should be available for public beta testers enrolled in the beta program that offered free Apple.
While there is still no information on any major changes to these updates, it is assumed that errors have been debugged and performance improvements have been made on the new beta versions of iOS and Mac OS Sierra.