BMW makes “no commitment” to having iOS in the Car (CarPlay).
You’ll notice BMW is no longer on the distinguished list of ‘committed partners’ at http://www.apple.com/ios/carplay/

It’s no surprise because their onboard software has been nicely re-engineered over the years.
http://www.bmwusa.com/Standard/Content/Innovations/Engineering/iDrive/default.aspx

Read more about BMW shunning Apple (for now):
http://www.bimmerfest.com/news/702511/bmw-say-no-thanks-to-apples-ios-in-the-car/
http://appleinsider.com/articles/13/06/12/bmw-shuns-apples-ios-in-the-car-to-stick-with-its-own-technology
http://www.autoblog.com/2013/06/12/why-bmw-doesnt-plan-to-integrate-apples-ios-in-the-car/