Apple has just released new beta versions of iOS 11.4.1 and tvOS 11.4.1 for developers to test.
This morning sees the release of iOS 11.4.1 beta 3 (build 15G5072a) and tvOS 11.4.1 beta 3 (build 15M5071b).
The new downloads come one week after second betas were made available. We should expect the third beta of macOS 10.13.6 to follow up shortly.
These updates should address bug and performance-related issues, as no major features are expected. Stay tuned for updates.