I might guess it's the dimmer control for the instrument panel. I'll make sure to check it out at the New York show in April.

Can't wait for that show; haven't seen it in person yet.
As a further interior question, is the stereo a regular DIN size? It looks like it is, though it seems like every new car comes with a silly size to make it harder to replace them. I'd think a Blaupunkt Tokyo (silver face) would look great in there.