https://www.theverge.com/2018/4/14/17238124/google-android-p-navigation-bar-gestures-screenshot-rumors

Google is testing a new navigation bar for Android P that looks similar to Apple’s new gesture and UI on the iPhone X. Google accidentally revealed the new navigation bar in an Android developers blog post (cached copy), and the company removed a screenshot it posted of it in action. The new navigation bar no longer includes a multitasking button, and the center home button looks far smaller and pill-shaped.

9to5Google reports that Google is testing a new navigation bar that’s similar to the iPhone X, with a swipe up gesture that reveals the multitasking UI. It’s not clear if the pill-like button, that looks similar to the one found on a leaked Moto X5 image, still works as a button, or is simply an identifier to swipe up for home like the iPhone X. Google appears to still be including its back button control too, although 9to5Google reports that this only appears in the context when a back button is required.