https://www.theverge.com/2018/5/8/17326890/android-p-gesture-navigation-announced-google-io-2018

Android P is shaping up to a be a big update for Google’s operating system, down to the basic way you navigate the OS, which Google is overhauling in P with a new, gesture-based system similar to the one on the iPhone X (or Palm’s webOS, if you prefer to trace these things back to their original source.)

As rumored, instead of the familiar, three-icon array of on-screen buttons that have been a mainstay on Android phones for years (even Samsung, a long-time holdout for real buttons, uses them now), Android P borrows a page from Apple’s book and offers a single, oblong line at the bottom of the screen that you’ll use to swipe around the OS. Some things are still the same — just like before, you’ll be able to tap to go back to the home, just like you always have been, and holding down the home button will still bring up Google Assistant.