While all smartphone manufacturers are working to shrink the bezels, Google is purposely going back to a larger bezel.
According to leaks, the Pixel 4 will feature a thick forehead that will house a bunch of gadgetry including dual front-facing cameras, an IR face scanner, an earpiece-cum-speaker, and a pretty wide oval opening that is assumed to be for "Project Soli" radar sensor.
Notably, we have seen something similar on LG's G8 ThinQ
Earlier this year, LG offered a similar experience on its G8 ThinQ. However, instead of using a radar-based motion sensor (like Soli), LG used a ToF sensor and IR projector to recognize shapes and their distance by calculating light response time.
With this tech, the phone offered "Air Motion" feature that allowed one to take screenshots, control media, and even navigate using hand gestures.
Samsung is also likely to offer gesture support on S-Pen
Apparently, Samsung is also likely to offer similar gesture-based technology. According to leaks, the S Pen is touted to come with "Air Actions" gestures that will allow you to navigate through the phone's UI without having to touch the display.