Hi, Ranee! I am a pre-planner, too, and like to make my reservations as soon as I know my dates; however, since I have done this many times, I must tell you that you will have to be the one to watch for promotions to be released. When (or if) promotions are released, you can modify your reservation, subject to availability. Disney will not automatically modify your reservation, you will need to call 407-W-DISNEY to check availability and make the change, if possible. There will not be a fee to update the same reservation with the promotion. If it's a free dining promotion, you will be reimbursed for the dining plan if you have already paid for it, or if you haven't already purchased it, you could add it at no charge at that time. You will need to keep an eye on the
Special Offers page for a promotion that might work for you, your travel dates, and your accommodations. Happy planning and have a Magical vacation!