https://arstechnica.com/gadgets/2019/06/rumor-google-pixel-4-to-have-radar-enabled-gestures-thanks-to-project-soli/

We're at least four months out from the typical Google Pixel smartphone unveiling, but that isn't stopping the rumor mill from churning. There are already a pair of reports pointing toward a Project Soli-based gesture system being in development for the Pixel 4.