If you have an annual pass or multi-day tickets you can receive a gift card for the amount of a one day magic your way base ticket. I think this is $75?
I'm not sure what all restrictions are on the gift card but it has to be used on your birthday. There is some kind of all day fast pass you can receive instead of the ticket or gift card.
I think it is a great idea. We are usually there for both by husband's and my birthdays and we have annual passes, so the gift card will be a nice addition for the parks.