@LlabTooFeR, the source of several previous leaks on HTC, has tweeted out some supposed camera information for the Pixel XL.
HTC Nexus (M1) = Marlin = Pixel XL will be featured with Sony IMX378 (12mp) main camera and IMX179 (8mp) front camera.
— LlabTooFeR (@LlabTooFeR) September 2, 2016
Sony has not put out any information about the IMX378, but we do know that the IMX179 is a 1/3.2-inch sensor with an effective resolution of 8 megapixels. Both of last year’s Nexus 5X and Nexus 6P got the IMX377 as their main sensors, so how much of an improvement we can pull above 1.55μm pixels and a maximum capability of 4K 60fps video is going to be a pressing question to answer.
Also a need-to-know bit: will the regular Pixel get the same camera setup?