> My brother-in-law got a new Honda Accord a few months ago, and says on the highway he can just take his hands off the wheel and let it do it's thing.

I have the new Accord. It's not really autonomous. Adaptive cruise control and auto-braking aren't bad, but the lane keep mostly just jiggles the steering wheel to notify me when I depart the lines, and all the time it mistakes construction and seams in the pavement as lane lines.