Gmail gains new gestures on Android in the latest update

The first change that you'll only notice if you head to General settings / Swipe actions is the addition of new gestures. You'll now be able to swipe right or left on an email, but you'll have to enable these actions from the new Swipe actions menu.
The update isn't available via Google Play Store, so you'll have to wait for Google to enable it via a server-side toggle. It's yet unclear how long it will take for the update to arrive on all devices, but it looks like it's been rolling out for about a week or so.