https://thenextweb.com/google/2018/08/23/report-the-pixel-3s-second-front-camera-will-be-used-for-super-selfies/

Despite the myriad of leaks so far, one of the big mysteries surrounding the Pixel 3 is why the phone has two cameras on the front but only one in the rear. Now a report by 9to5Google gives an explanation: something called Super Selfies.

According to 9to5Google’s sources, this is largely related to making portrait mode better for selfies, even though I thought the Pixel 2 already had the best implementation outside of the iPhone X.