https://www.cnet.com/news/ios-12-things-what-we-want-to-see-at-apple-wwdc/

Apple's WWDC conference is almost here, and while we expect a focus on software and services over hardware, we can be sure of one thing: a preview of the next version of iOS. The last version of Apple's iPhone and iPad operating system, iOS 11, had some pretty significant updates: a new control panel, ARKit, new Siri functions, central file directories, more Pencil support on iPads, a whole new iPad multitasking system, and more system storage management control. And that doesn't even include some notable features that came in followup point releases, including a battery health beta and improved ARKit in iOS 11.3, and Apple Pay Cash in iOS 11.2.

Reports suggest that iOS 12 might be more of a "High Sierra" style update, fixing bugs and improving overall function, saving a broad overhaul with big new ideas for iOS 13 in 2019.