Voice commands already do most of this on Android pretty easily, and have for a long time. It looks like the real advantage here is setting it up before you start driving and being able to interact without long pressing the search button - but that seems pretty rough on the battery.
We agree a large part of the advantage is not touching the phone at all. I disagree about voice commands though- if you put that app in the hands of someone who's never used it before, most people will give up before they successfully send a text.
