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,

At WWDC 2025, Apple revealed a major visual shake-up for iOS (not to mention the rest of the company’s operating systems). This is the biggest change, aesthetically, since the shift away from the stitching,

Apple has confirmed iOS 26’s public launch this fall, following the release of beta 4 to developers and testers with major UI and Apple Intelligence updates.