Will the voice control option activate Apple's Siri assistant?

I noticed Porsche was not listed in this press release.
Apple's VP of iOS Software Scott Forstall just demoed Eyes Free, Siri's new vehicle integration. The feature is being framed as a safety booster, letting you tap a steering wheel-mounted button to toggle Siri on your iOS device, rather than reaching around for your iPhone or iPad and taking precious seconds away from the road. This being Apple, there are already plenty of partners lined up -- BMW, GM, Mercedes, Land Rover, Jaguar, Audi, Toyota, Chrysler and Honda are all said to be on board, with Siri support making its way to vehicles within the next 12 months. It's certainly not the first example of smartphone/car integration we've seen, but it could soon end up being one of the most widely utilized, despite the years-long head-start competing technologies have enjoyed.

http://blog.caranddriver.com/siri-in...ure-will-work/

 

With the iphone bluetooth connected, if you activate Siri on the iphone then the car's bluetooth microphone activates and will work features on the phone. This works without the Porsche voice control option

For example, If I ask Siri for a certain song, it will play. If I ask her to dial a contact, the call will be placed.

 

Do you still have to hold the home button on the phone to activate Siri? Siri really does make the voice control option outdated.