Apple is very reliable when it comes to constant updates of their operating systems and now, less than a week after Apple dropped the last batch of betas, another new build of iOS 10.2.1 and MacOS Sierra 10.12.3 were released to the developers. The new betas brought different enhancements and performance improvements, however, it appears that there are no new features brought.

There are no major changes to the second beta release. However, MacOS release notes indicate that the changes should have more "stability, compatibility, and security" in MacOS 10.12.3. Considering that the feature-packed released has already been made for the iOS 10.2 and the changes that are made in MacOS 10.12.2, it is unlikely that there will be a major change for the new beta versions. The new versions are expected to resolve the issues that were not addressed in iOS 10.2 and MacOS 10.12.2 releases.

According to Apple notes, this update aims to:

- Improve setup and reliability of Auto Lock.

- Allows addition of a Chinese Trackpad Handwriting button to the Touch Bar Control Strip.

- Adds support for taking screenshots of the Touch Bar using the Grab app or Command-Shift-6 shortcut.

- Fixed an issue that caused the Touch Bar emoji picker to appear on the display.

- Resolves graphics issues on MacBook Pro (Late 2016) computers.

- Fixed an issue where System Integrity Protection was disabled on some MacBook Pro (Late 2016) computers.

- Improves setup and opt-out experience for iCloud Desktop and Documents.

- Fixes an issue with the delivery of Optimized Storage alerts.

- Improves audio quality when using Siri and FaceTime with Bluetooth headphones.

- Improves stability of Photos when creating and ordering books.

The Enterprise content would include:

- Improvements to performance when searching the Global Address List for a Microsoft Exchange account in the Contacts.

- Improves reliability of Calendar when using delegate calendars and snoozing Microsoft Exchange events.

- Improves support for smart card authentication at the login window.

- Allow 802.1X clients configured to use System Mode to automatically reconnect to the network when users log out.

For those who have signed up to Apple's Beta Testing program will receive the update on MacOS Sierra beta if they go to Mac App Store through the Software Update Mechanism, per Tech Times. If you want to participate in the program, you can sign up on Apple's Beta Testing website. Through this, public testers will have access to both iOS and MacOS Sierra betas.