So,will it be an Atom Z series, or an Atom N series?
Single core, or dual core?
@800 or 1.667Mhz?
The Z-series would make sense, seeing that other than playing back radio, and some advanced GPS functions, and a visual feedback system from the car's electronic sensors, the display isn't really used for a lot.
Perhaps the Atom will be good enough to provide the fluid frame 720p nightvision from the BMW series; but I doubt anyone is going to drive their cars looking at the screen instead of the road.