Where is the USB port located? inside the armrest like the AUX port, or inside the glovebox like the iPod interface?
I certainly would prefer a USB port over the apple specific iPod interface. But speaking of playlists, what format would they be in?
I suspect that MP3 files on a USB device would be handled like MP3 files on a CD-R/DVD-R are right now, basically a collection of directories with music files that you can play random or in order, either all the files or by directory.