Do they? Most I see just cruise down pretty open residential streets grabbing convenient cans. Like most things it'll probably be a mix, most service would be covered by automated trucks with the more troublesome routes still driven by people until the kinks get worked out.

I would imagine actually picking up the cans is the hardest part. they often look different from each other, people place them haphazardly, and you might even have to distinguish trash from recycling.