According to a series of news articles, the new iPhone 5 may come with a new connector that may cause problems with music playback systems in some cars.
Apple decided to get rid of the 30-pin connector, which many car manufacturers like Kia use. According to the reports, the standard analog connector that used the 30-pin to connect the iPhone or iPod to the car stereo will not be found at the iPhone 5. However, the company states that any cars using USB or Auxiliary should not have a problem.
For more details on this new iPhone feature, read the full article here:
Did the iPhone 5 Just Make Your Car Obsolete?