It was announced yesterday that Nissan, Mazda and Daihatsu would be joining the likes of MINI, BMW, Alfa Romeo and smart by offering iPod integration in their 2006 vehicle lines of Japanese vehicles. While this is good news for the iPod Nation, two things were unclear in the articles we found that covered this story. The first was whether or not this integration consisted of merely an auxiliary input in the stereo's head unit or a more direct line-in from the iPod's dock connector like the one offered by BMW. The article we've linked to from PC World implies a more direct line-in, as it mentions being able to control the iPod through the car stereo, a feat not possible with a mere auxiliary input. The second was whether or not Nissan and Mazda would be offering iPod integration in their North American line-up of 2006 vehicles.