Ars Technica:

Roughly two months after its annual I/O conference, Google this week invited Ars and several other journalists to the THEP Thai Restaurant in New York City.

Over the course of the event, we heard several calls, start to finish, handled over a live phone system. To start, a Google rep went around the room and took reservation requirements from the group, things like “What time should the reservation be for?” or “How many people?” Our requirements were punched into a computer, and the phone soon rang. Journalists—err, restaurant employees—could dictate the direction of the call however they so choose. Some put in an effort to confuse Duplex and throw it some curveballs, but this AI worked flawlessly within the very limited scope of a restaurant reservation.

Reading the reports about this demo are very interesting but it also seems pretty clear this is a long way off from being a real product.