My wife received the offer, but hers was for the following:
"As a valued Citi(R) / AAdvantage(R) cardmember, enjoy this exclusive opportunity to earn up to 1,000 bonus miles(1) from the AAdvantage Dining program through April 30, 2005. Here's how:
Register for this promotion today to get your bonus miles at
http://aa.rewardsnetwork.com/acm305
Earn 1,000 bonus miles when you dine six times
Earn 500 bonus miles when you dine four times
Earn 250 bonus miles when you dine two times"
It appears that the offer is for 1,000 miles for 6 dines, 500 for 4 dines, and 250 for 2 dines if you have the Citi/AAdvantage Card, and half that if you do not.