The new Cadillac CT6 has a rear view camera and display:
Cadillac to Debut New Rearview Mirror/Camera Display on CT6 Sedan
To meet the requirement of having a rearview mirror, it tilts via the old day/night button and becomes a regular mirror.
Driving up behind one is odd, you don't see the driver's face in the rearview mirror like you are used to, you see the front of your car. Driving one is a bit odd too, people still reach up and try to adjust it, it moves, but the view doesn't change.