AMEX USA now has a website for Chip & Signature:
http://chipandsignature.americanexpress.com/
Originally Posted by AMEX
Will all American Express Card members receive chip & signature Cards?
At this time, we are only offering chip & signature Cards on Basic and Additional Personal and OPEN Platinum Cards and Centurion Cards. If you did not receive a chip & signature Card and would like to request one for any of these eligible Cards, please call the number on the back of your Card.