One of the lesser-known additions to iPhone 4.0, "iPod Out," may be intended in part to support integration with vehicles, a source suggests. When a handheld is connected to a device supporting the iPod Accessory Protocol, iPod Out will allegedly bring up a special interface (seen below) to be fed to a secondary display, with a simplified menu system resembling the one on the iPod classic and nano. Evidence for a connection to cars is said to come from two strings in iPod Out code, "IAPSimpleRemoteCarButtonNotification" and "IAPSimpleRemoteCarButtonTypeKey."
