Thinking some more about next week's release (should be very exciting!), Andromeda and the image previously posted of the rear of the Pixel phone, have a theory about the antennae line at the bottom of the rear of the phone and why half of the phone is covered in glass.
Perhaps with Andromeda, the phone becomes the CPU and the back of the phone becomes the mouse. Assuming you use Chromecast, the TV becomes your display screen. Add a Bluetooth connected keyboard and your have a full PC in your pocket. If Google announces the functionality and actually brings it with the Pixel phones, that would seem a big deal. Even if they just announce the functionality, they could say that the Pixel phones will get it first.
Plausible?