Developers will now be able to test the newest (fourth) beta version of Mojave 10.14.5, which comes just a week after Apple seeded the third beta of this macOS.
According to reports, this update includes bug fixes, including an issue that was known to prevent users from playing copy-protected videos on iMac Pro. The Accessibility Events switch is no longer available in this beta version of macOS, since “related aspects of the W3C AOM effort are no longer applicable”.
Among the few new features that have been spotted so far, is the support for the Reiwa (令和) era of the Japanese calendar. In beta 4 of Mojave 10.14.5 the first year of the Japanese calendar era is now presented as “元年” (“Gannen”) instead of “1年”, with the exception in the short numeric formats that use the narrow era name.
Also, all kernel extensions that were signed after April 7th (this year) must now be notarized in order to be able to load on this OS version.
If you are eager to test it out yourself and see what improvements or new features might be included with the new update, you can do that by following THIS download link and signing in to Apple Developer with your Apple ID.