"They have created a dock that allows both audio and video to be streamed throughout the car". I didn't get it at first so I asked Bill:

Zune-Online: Maybe its time to go to sleep, but what do you mean "throughout the car" ? Make it a bit more clear...

Bill Wittres: Throughout the car means both front and back seats. This is particularly relevant on the video side when you have a car that has a DVD player and screens in the back seat. Make sense?

OK now I got it! Take a look at the pictures below, click for bigger version:

Source: ZuneGuy 
Productspage: imedock.com