Many of the software features announced (including much of the camera stuff) are coming to the earlier Pixel devices as well.
There are 3 key differences with the new device (the XL anyway) - full glass back (allowing Qi wireless charging), updated displays, dual front-facing cameras (wide angle selfies, requires a notch on the XL). Sure, the SoC (processor) is updated to the SD845 but there is becoming less and less focus on that level of specs.