The iPod interface that comes in the Scion XB will work with the iPhone. You will get the warning when pluging it in and be prompted to enter Airplane mode. Click NO and everything works just like the 5th Gen did. You will sometimes have to dock it twice but other than that I have had no problems with it.

It also works with the Kenwood IP500 with a couple of small issues. (see other thread on this board.)