https://wccftech.com/beta-4-of-ios-11-4-1-macos-10-13-6-tvos-11-4-1-now-available-watchos-4-3-2-beta-3-too/

Apple has seeded beta 4 of iOS 11.4.1, macOS 10.13.6 and tvOS 11.4.1. Apple Watch developers can download watchOS 4.3.2 Beta 3 too.

If you have iOS 11.4.1, macOS 10.13.6, tvOS 11.4.1 or even watchOS 4.3.2 installed on one of your devices, then you will be pleased to learn that you can download new betas right away over the air. The latest software update is available to download directly from the Apple Developer Program portal as well.