https://www.cnet.com/news/pixel-4-4-xl-rumors-price-specs-leaks-features-everything-else-dual-camera-android-q/

While previous Pixel XLs launched with just a single camera on the back, leaked photos posted on SlashLeaks indicate that the Pixel 4 XL may have two rear cameras. Google has typically relied on its camera software to do things (like taking portrait photos) that other phones require multiple cameras to accomplish. 

The same leaked photos also show that the yet-to-be announced phone may have a hole-punch display solution for its two selfie cameras, similar to the Galaxy S10 Plus.