Some insiders call iOS 18 the most serious update to the system in its entire history. It is not yet clear whether this will be so, but new data suggests that iOS 18 will at least bring a noticeable change in design.
It is possible to understand approximately how the system will look now, because it will be similar to VisionOS.
It is reported that iOS 18 will receive translucent elements and a new design of system applications, including Safari.
There is direct confirmation of all this now: in tvOS 17.2 a semi-transparent side panel appeared. Apparently, this is how many other elements will look on iOS 18 and its variations for other devices.