This is cool. The major car makers are working with Apple to add a "Siri button" on the steering wheel that allows you to communicate with Siri without having to take your hands off the wheel or your eyes off the road. BMW, GM, Mercedes, Land Rover, Jaguar, Audi, Toyota, Chrysler and Honda
will be integrating a button on the steering wheel that supports Siri. This feature will be part of the upcoming iOS6.