From the New York Times:

CUPERTINO, Calif. — For its next act, Apple is turning the iPhone into a personal assistant.

The company on Tuesday unveiled an eagerly awaited new version of the device, the iPhone 4S, that comes with a “virtual assistant,” Siri, that recognizes voice commands by users to schedule appointments, dictate text messages and conduct Web searches.

Although the new phone is virtually indistinguishable on the outside from its predecessor, the iPhone 4, the company says it is packed with better technical innards, including a more advanced camera. The phone also includes a more powerful chip known as the A5, the same microprocessor that acts as the brains inside the iPad.

Photo from ARS Technica