There are hints of Gmail finally getting dark mode. The latest version of the app (2019.08.18) shows its splash screen and widget sporting the dark mode colours. If you run Android Pie and have night mode activated, you'll see this. The next version of Android, Android 10, will be bringing a system-wide dark mode that lets you change colour schemes with just a single tap. Apps like Chrome, Google Maps, and Google Play have been prepared for this. And it looks like Gmail is up next if this update is any indication.
Another useful feature made its way to Gmail. It's now easier to swap from one Gmail account to another. Instead of having to select the account over at the icon at the top right, you just need to place your finger on the icon and slide up or down. The same feature has appeared in Google Maps and Google Drive before.
Source: TechRadar