It doesn't steer. It augments the cruise control, accelerating and decelerating in stop-and-go traffic (see https://www.youtube.com/watch?v=PcwObeGB_mU). Which isn't nothing, but it's not driving you to work.
I've heard them claiming that it could indeed drive you from home to work using public roads and that it is capable of finding you and driving the car to you when you call for it (aka. "Batmobile mode").