Indeed, Liquid Glass does bring somewhat of a major change to iOS 26, or what we would have called iOS 18 (Apple is switching iOS numbers to years, and iOS 26 will release in the fall). I've been using the developer beta of iOS 26 for some weeks now,

Apple has released iOS 26 Beta 4, and with it comes a bold revival of a concept first teased at WWDC 2025, the Liquid Glass interface.

WatchOS 26 brings the Liquid Glass look, helpful Smart Stack hints, and easier Workout app customizations to your Apple Watch. I took the beta for a spin, and here's what I'm liking.