Now, the new S-Class doesn't literally "drive itself" but it almost certainly could if the engineers at Mercedes had wanted it to.
When you're on the highway, the S-Class will automatically maintain a safe distance behind the car ahead. By itself, that's nothing new. Lots of cars these days have so-called Active Cruise Control. Like some other automakers, Mercedes' system functions even in stop-and-go city traffic.
But the S-Class takes things even farther than most. The new S-Class actually steers to stay in its lane, even around curves. You do have to keep your hands on the steering wheel, though. Take them off for more than a couple of seconds and the car gives control back to you. Mercedes doesn't want you forgetting that you're still in charge.