Famously Google has just one rear camera in every Pixel model big and small. The company has been using AI and machine learning to create photo rival telephones with two rear cameras such as the iPhone XS or three back cameras such as the Huawei P20 Pro. The secondary camera can be used for something other than photography as probably AR.
Drawings of unreleased 4 XL also show an oval-shaped display for two selfie cameras like the new Galaxy S10 Plus. Famous, Pixel 3 is missing in one notch while Pixel 3 XL has one of the largest ones found on any phone.
Drawing enough curious does not show a fingerprint reader behind. This shortcoming may indicate that the next Pixel phone will have an in-screen fingerprint reader such as OnePlus 6T and Galaxy S10.
Of course, the drawing is not verified so it should get a grain of salt.
Google did not immediately respond to a request for comment.