Users of recent 15-inch MacBook Pro models need to install an updated version of macOS that was just released this morning. Details are scanty, but Apple says this fixes an unspecified firmware issue related to the T2 security chip.
The fifth beta for iOS 12.3 was released to developers this morning, arriving just one week after iOS 12.4 beta 4 came out. Apple seeded watchOS 5.2.1 beta 5, tvOS 12.3 beta 5 and macOS 10.14.5 beta 5 to developers as well.
It appears that this beta mostly focuses mostly on performance fixes as Apple readies it for launch soon. iOS 12.3 will probably be the last major update before Apple reveals iOS 13 at WWDC 2019 at the beginning of June.
Apple is back with a brand new batch of beta software for developers, including the third beta of iOS 12.3.
Update: The public can now also install the latest iOS beta on their iPhone or iPad.
The iOS 12.3 beta arrives two weeks after the last version came out, bringing with it new features to the Apple TV app along with plenty of bug fixes. There are also new beta builds for macOS 10.14.5, tvOS 12.3 and watchOS 5.2.1.