A new update to Google Assistant brings a design element familiar to Pixel users to all other Android phones. You may or may not have noticed that the Pixel light bar is showing up on non-Pixel phones. When you activate Assistant by pulling it up from the bottom, you'll see light streaming in from the lower sides of your phone as the Assistant slider pulls up.
The Snapshot feed can be launched from the bottom-left corner, while the keyboard input on the right (which also features a new design). The new look also gets rid of the center pill. And as you issue commands, the light bar pulsates. It doesn't seem to be limited to users enrolled in the Google beta app.
Source: 9to5Google