According to 9to5Mac, Apple is set to release the third developer work for iOS 12.3 within one hour. The update is likely to patch unknown errors and vulnerabilities from previous versions. It also comes a week after we got our first insight into the many changes that come to iOS 13. If that means we will see some new 12.3 functions, then it is not yet to be seen.
We do not know exactly what iOS 12.3 developer beta 3 has to offer until Apple publishes both that and the release notes, but we will keep our eyes open for any changes that will come. Apple usually updates beta software at 1 pm EDT – 10 AM PDT – then put your alarm and make sure to update the "Software Update" pages.
If you're a general beta test, Apple usually publishes the public beta 3-24 hours after dev-beta public beta 2 released one day after dev beta 2), so sit tight. The issue notes below were also pasted, so it remains to be seen whether something will be addressed or added.
Date and time
- Support for the Reiwa (?) Era of the Japanese calendar, beginning May 1, 2019, is now available. The first year of the Japanese calendar is represented as "??" ("Gannen") instead of "1?", Except in the shorter numerical formats that usually also use narrow email names; for example: "R1 / 05/01". (27323929)
- You may experience unexpected behavior when changing the system time until May 1 when using a device with the system language and calendar set in Japanese. (49371044)
To download and update your iPhone to iOS 12.3 dev beta 3 when it is released, you must first be a registered developer with a valid configuration profile. If you have enabled "Automatic Updates" in iOS 12, you can have the software updated overnight. To install directly, launch the Settings app, select "General" and then "Software Update." Click on "Download and install" and then follow the instructions on the screen.
So far, iOS 12.3 has been a minor update compared to previous versions. Beta 2 saw Japanese date and time updates as well as a customization to your Wallet transaction history, while beta 1 introduced us testers to Apple's new "Apple TV channels", complete with free channel and service trials, newly developed icon, updated user interface  Don't Miss: All New Apple TV Features in iOS 12.3 for iPhone