Current offer (as of 7/1/16):
"A special offer for Ameriprise Clients: $0 introductory fee for the first year, then $550. Additional Cards can also be added for an introductory fee of $0 for the first year, then $175 for up to 3 Additional Platinum Cards. Earn an additional 5,000 Membership Rewards points for every $20,000 in eligible purchases on the Card, up to 30,000 additional points per year."

https://www262.americanexpress.com/d...rsion/personal

(In 2015 the offer included 25k MR points for $3,000 spend, with $450 annual fee waived.)
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Is this card a different product than the normal personal Amex Platinum?
Yes, by all indications this card is treated differently. Multiple members have received the bonus after previously having a personal Platinum card. Members have also been able to use the travel credit on this card even after obtaining the travel credit on a personal Platinum in the same year. (Post 363)

Do authorized users have a fee?
The fee for additional users is waived for the first year. You can add authorized users at $0 when signing up or you can add them later by calling the number on the back of your card.

My decision is "in progress", what should I do?
Many users report that they received an "in progress" decision initially only to be approved within the next 48hrs with no additional communication (recon call). Click here to check status.

Does one need to be an Ameriprise customer to be approved for this card?
No, one does not have to be an Ameriprise customer in order to get approved for the card, although AMEX could technically enforce the "rule" in their terms and conditions and either cancel your card or convert it to a "regular" Platinum.