I'm not positive that you won't be able to use your Reward dollars for the
DDP once the new system goes into affect.
As the following statement from the MS website reads:
.
Just prior to the start of your vacation could still mean at check in. If not you can obtain the Disney Visa reward card in advance and when you call 48 hours before your arrival give MS that Visa reward card number to pay for your DDP. Tell this is a one time charge and that card is not to be entered as a credit card on the account.