From Pioneer:
For owners of current AppRadio 2, AppRadio, and Advanced App Mode products*, please read the following important update:
Your Pioneer product is compatible with iOS 6 installed on the iPhone 4S or iPhone 4.
At this time, two operational issues, listed below, have been identified. To resolve these issues, both the Pioneer AppRadio app and each compatible third-party AppRadio app require an update.
1.) Apps cannot be successfully launched from the AppRadio screen.
2.) Pinch to zoom is disabled.
As of September 18, 2012, an updated Pioneer AppRadio app has been submitted to the App Store for review. We will post more information when this app is available in the App Store. The developers of compatible third-party AppRadio apps are also currently working to update their respective apps. The update and submission process may vary for each compatible third-party AppRadio app.
We will continue to post updates regarding app availability.
* Model numbers vary by region. Applicable U.S. models are as follows: SPH-DA100, SPH-DA02, SPH-DA01, AVIC-Z140BH, AVIC-X940BT, AVH-P8400BH