Apple has released a second round of developer betas for iOS 11.4, tvOS 11.4, and watchOS 4.3.1, approximately two weeks following the initial set of betas. The release notes reveal only minor changes and fixes compared to the first beta, which brought back Messages in iCloud expressly “for testing and evaluation purposes” and saw the return of AirPlay 2 support in iOS — both features that made an appearance during the iOS 11.3 beta cycle…