Don't take this the wrong way...here's my opinion.
Another topic completely...but if you're doing 75 in the fast lane, and playing on your phone...you're getting cut off by everyone else. (You need to hold a button down for the voice control, and avert your gaze to make sure it heard you correctly...c'mon, you know you'll look...I would.)
Microsoft sync has been included in vehicles and there are other comparable if not better voice recognition systems in vehicles today. Unless there is a holster for the iphone that would put it in safe arm's reach and not in your cup holder or in your lap, making you have to look further than your radio controls...I don't see how this is making anything safer.