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Looking at the leaked renders and screen protectors, there was a mysterious and quite large cutout on the right of the Face ID-style module. The best guess was that Google will use it to revolutionize its Pixel phones' interface navigation by introducing the gesture recognition platform it has only had in prototype form so far, and Google just confirmed it will indeed employ it with the official name Motion Sense. The chip that makes it possible is dubbed "Soli," and employs "a new sensing technology that uses miniature radar to detect touchless gesture interactions."
Google's Project Soli sounds suspiciously like what LG did with the Multi ID and hand-tracking algorithms enabled by the 3D-sensing front camera kit on the G8 ThinQ, yet relies on radar waves to detect the motion of the human hand. You know, like in this GIF below:
Google's successful miniaturization of the technology fits in a Soli chip that is small as a pinky nail, yet can detect the minutest of motions. It works on the same principle as the big flight radars that detect airplane movements in the sky. Unfortunately, this was precisely why the FCC didn't let the Soli chip fly until December 31, 2018, when it granted Google a waiver from some of its requirements for radars in the commercial 57-64 GHz frequency band with the following:
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