Preview at WWDC likely in June, followed by September launch.
Apple Releases First Beta of iOS 11.2 for Developers [Updated]
Registered developers can download the iOS 11.2 beta from Apple's Developer Center or over-the-air once the proper configuration profile has been installed from the Developer Center.
It's not yet clear what's included in the iOS 11.2 beta, but it could potentially introduce support for features that were not included in the original iOS 11 release.
Apple has said both peer-to-peer Apple Pay payments and iCloud support for iMessages will be introduced in later iOS 11 updates, and neither of these features has appeared in the iOS 11.1 beta, though employees have been testing Apple Pay Cash.
iOS 11 marks a major update to the operating system, with systemwide design tweaks, a new Lock screen experience, a revamped Control Center, and an entirely new interface for the iPad that includes a Dock, Drag and Drop support, and a redesigned App Switcher for better than ever multitasking.
Update: iOS 11.2 introduces a fix for an animation issue that caused the Calculator app to work improperly, a new Now Playing option for controlling content on the Apple TV in Control Center, redesigned camera emoji, and a new loading animation for Live Photos effects. It also appears to introduce the TV app for Sweden and Norway.