I booked back in February and just recently received a pin and was able to apply it. Granted she had to make sure they had "available" rooms for the promotion but my reservation confirmation number is still the same and such. If you get a pin, call ASAP to apply it to make sure you can. If a public offer comes out, again call ASAP and tell them you want to add the offer to your existing reservation to ensure you are able to do so without changing dates/resort choice.