When this morning's news regarding iOS 11.3 made no mention of Messages in iCloud, many feared the feature was delayed indefinitely. But with the release of the first developer beta, it's now been confirmed that Messages in iCloud is available in 11.3. Guilherme Rambo reports for 9to5Mac:
With the release of iOS 11.3 beta 1 and corresponding developer release notes, Apple announced that iOS 11.3 includes the Messages in iCloud feature. Messages will prompt users to turn on Messages in iCloud on first launch after upgrading to beta 1. Users with two-factor authentication and iCloud Backups enabled will get Messages in iCloud enabled automatically.
It's not certain that Messages in iCloud will make its way into the public release of iOS 11.3, but its presence in the first beta is a positive sign at least.
First announced at WWDC last June as an iOS 11 feature, Messages in iCloud is just what it sounds like: all your Messages across all your devices are stored in iCloud and kept in sync. The feature was present throughout the iOS 11 beta cycle last summer, but was removed before iOS 11's public release. I never had any issues with it during the beta season, but clearly some users did, causing Apple to delay the feature until its reappearance now.