These renders are by no means "Google Official", but they are probably the next best thing to the real deal. The Pixel 3 has the least dramatic design changes compared to its Pixel 2 predecessor and continues to feature rather beefy bezels both at the top and bottom of the smartphone. It does, however, have a tall 18:9 aspect ratio, which is becoming more popular on flagship devices. We can also clearly see a stereo speaker arrangement, a single camera lens on the rear of the smartphone and a centrally-mounted rear fingerprint sensor.
The Pixel 3 XL is of course the more daring design, as it adopts a deep notch at the top of the display. The notch houses what appears to be dual selfie cameras and a speaker (among other sensors). Another speaker is found on the bottom face of the smartphone. Out back, there's much of the same with a design that's similar both to the new Pixel 3 and the current Pixel 2 XL.
Previous reports and leaks have suggested that the Pixel 3 will have a 5.3-inch display, while the Pixel 3 XL will bump that up to 6.2 inches. A Qualcomm Snapdragon 845 processor is pretty much a given at this point, along with potentially 6GB of RAM on the Pixel 3 XL. Other than the fact that the a single-lens remains on the back of both phones, there has been no credible information or leaks on what upgrades have been made this time around to the primary camera.