iOS 11.4 Developer Beta 4 was just seeded to Developers!
It was released less than a week after Beta 3, coming in at around 250 mB with a build number of 15F5071A.
iOS 11.4 Beta 4 contains mostly bug fixes, and Geekbench scores come in at about the same on the iPhone X as iOS 11.4 Beta 3. However, iOS 11.4 Beta 4 performance is much smoother and responsive on the iPhone 7+ than Beta 3. This is visible through less erratic animations and faster app opening times.
Both Airplay 2 and Messages on iCloud are expected to be included within the official iOS 11.4 release.
iOS Public Beta 4 is expected to be released within the next couple of days given that no fatal errors occur that limit primary functions.
5-6 beta releases are expected in total, and if new releases follow this recently established weekly schedule the final 11.4 release should be expected at WWDC.
Image via: 9to5 Mac