Only four days after the public release of iOS 11.3, Apple has already begun testing of iOS 11.4, releasing the first beta to developers yesterday afternoon. The release notes for the initial iOS 11.4 beta list few significant changes, although they note the return of Messages in iCloud — a feature that was promised for iOS 11 last fall and introduced to beta testers in the entire iOS 11.3 beta before being omitted from last week’s final release. However, Apple once again indicates that the feature has been included only “for testing and evaluation purposes,” suggesting that it may still not be rolled into the final iOS 11.4 release either. The same conditions also apply to Messages in iCloud as for the earlier betas — users will be prompted to turn the feature on after upgrading to the iOS 11.4 beta, however users who have two-factor authentication and iCloud Backup enabled will have the feature activated automatically. No other new features are highlighted in the iOS 11.4 beta, which appears to still be lacking the AirPlay 2 features which briefly appeared in early iOS 11.3 betas before disappearing near the end of the cycle.
Update: AirPlay 2 has in fact returned in the first iOS 11.4 beta, but requires an AirPlay 2 compatible target device on your network, such as an Apple TV running the new tvOS 11.4 beta. HomePod doesn’t work as an AirPlay 2 target, and will likely require its own HomePod software update to enable the feature.