Wow-- just got an e-mail from Hyatt about the promotion with a registration link, and almost did not see that there is an extra perk for Hyatt Card holders:
As a Hyatt Card member, earn an additional 5,000 bonus points after your first five nights, for a total of 15,000 bonus points.
It's interesting because this is the first time Hyatt credit card holders have been offered an additional promotion (other than the sign-up bonus, of course).