In before politicians and whoever else overreact to this. Really, this is no more a distraction than the myriad other in-dash display units that cars can be equipped with. Or radios, windshield GPS units, etc. Cellphones are actually the worst since when focusing on the screen, people alter their field of view. And in states where using a cellphone is illegal while driving, this only causes drivers to look down to keep the cellphone out of view, which is even worse.
In fact, with most video head units you cannot watch or play movies if the car is in drive. This is because in order to operate, head units are hardwired to the car's computer. Of course, with the snip of a wire or two one can bypass this safety feature. People will find a way to play content while driving if and when they really want to.