The iOS interface has not changed much since iOS 7 which abandoned the skeumorphic design. Then through iOS it was given several iterations but maintained the flat design which is now quite old. According to a Bloomberg report, Apple will introduce a new interface design at WWDC on June 10.
It was developed using the code name Solarium and it is rumored to take inspiration from the surface of glass penetrated by light. This interface element has been used in visionOS and will now be expanded to iOS, iPadOS, macOS, tvOS and watchOS. So far, no Solarium design elements have been leaked.
This step taken by Apple comes at the right time because Android 16 will use Google's Material 3 Expressive design which is more expressive and practical compared to the previous design. With all modern operating systems looking like two identical mice, a new, fresher design is needed.