The article is about Siri integration.
Maybe I'm not explaining myself correctly, it's not so much about using Siri through the car's BT connection as using the functionalities exposed by the phone through the BT connection.
Just like you can with any BT headset/speaker using any BT-enabled phone.
Again, Siri is just an example:
"With a Bluetooth headset, press and hold the call button to bring up Siri."
http://www.apple.com/ios/siri/siri-faq/
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