No.  Your interest rate is locked in even if national interest rates go up later on.

DISNEY VACATION CLUB	INTEREST                      INTEREST RATES                              RATES		DOWN PAYMENT
FICO Credit Score	1 to 7 Year terms	8 to 10 year terms
800 – 850	11.9% APR	11.9% APR	10% down
700 – 799	13.9% APR	13.9% APR	10% down
650 – 699	14.9% APR	14.9% APR	10% down
600 – 649	15.9% APR	15.9% APR	20% down payment required
	No Prepayment Penalties on All Loans