1. Google's Pixel 4 and Pixel 4 XL smartphones will reportedly feature a new motion-sensing radar technology called "Project Soli." This technology, developed by Google's Advanced Technology and Projects (ATAP) group, will allow users to control certain phone functions by making gestures in the air above the device.

2. The Soli radar chip is said to be small enough to fit into the top bezel of the Pixel 4 phones, enabling gesture-based controls like skipping songs, snoozing alarms, and silencing phone calls without touching the screen. This feature is expected to be a key selling point for the Pixel 4 lineup, as it sets it apart from other flagship smartphones.

3. The Pixel 4 series is also rumored to include other notable features, such as a dual-camera setup on the back, a 90Hz display, and the latest Qualcomm Snapdragon 855 processor. However, the inclusion of the Soli radar technology is seen as the most significant innovation, potentially paving the way for more advanced gesture-based interactions in future smartphones.