The second beta of iOS 11.4 has arrived for testers running their iPhones, bringing several bug fixes along with the new Messages in iCloud. The beta is only available to those who have registered their devices in the Apple beta program with the official release of the new version expected to be late in May or early June.
The big new feature in this build is Messages in iCloud which returns to the beta program. It originally showed up in the 11.3 beta program but was dropped and not released as part of that update. It appears that Apple has been doing their homework and will allow users to enable it. This will allow for new messages to be sync’d to your iCloud account along with photos and videos which will save space on your iPhone.