I want to stay at the Park Hyatt Tokyo in April 2013. My next app-o-rama will be in Jan, which will include the Chase Hyatt card. So, fearing that all the award rooms will be booked by the time I get my two free nights, I decided to reserve the Park Twin rooms today. All they needed was a credit card, and I can cancel free of charge as long as its a day in advance.

Does anyone know if I'll be able to use my free nights to pay for this reservation when I get them?