You and me both! No notification from HHonors, and thank you, FlyerTalk!
Since I know about the promotion, my major concern is the language in the T&C saying registration must precede reservation ("Card Members must first register for the promotion at hhonors.com/Amex5k, then book and pay for two (2) completed stays..."). I would like to see that changed to conform with Lauren's statement that existing reservations are eligible.