Apple released iTunes 11.4 Beta 2 for developers. It happened two weeks after the release of the first beta.
Developers who are registered on the Apple Developer Center can download the firmware to your computer and update via iTunes. Can also be updated over the air, if on a smartphone or tablet equipped with a special profile.
About changes in the new version nothing is known. Most likely, the update has corrected mistakes of previous releases, and enhanced security.
In iOS appeared 11.4 sync messages through iCloud. This feature Apple introduced at WWDC 2017 almost a year ago. In the new version of the system added support for AirPlay 2. Using the new Protocol you can connect multiple devices. First of all, it made for a bunch of several columns HomePod, but to test this function yet that is impossible, because the beta version of iOS 11.4 does not work with the HomePod.
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