Although iOS 12 beta is not available yet for the public, a recent leak revealed a few details about its successor. According to this leak, iOS 13 "Yukon" will come with an updated Files app, a home screen redesign, tabs in apps like in macOS, as well as other iPad-focused features.
https://www.notebookcheck.net/Upcoming-iOS-13-update-to-include-a-new-home-screen-various-iPad-focused-features.302272.0.html