I know one perk is kids ages 3-9 can visit WDW t for free...The offer is good for all guests who purchase a Walt Disney World Dream Maker package with their Disney-Bank One VISA card or any other VISA card. I believe it's from Jan 4-June 12 2004.
For parties of less then 8 members, there will be improved online planning tools and a new vacation planning kit. Plus the new attractions--Wish's, Philarmagic, Soarin'--eventually a new e-ticket stunt show at the studios, and Everest at DAK. two new resorts--Pop Century and DVC's Saratoga Springs.
For parties of more then 8, they have the Grand Gatherings.. which officially begin Nov. 24, 2003. They will have special exclusive experiences which you can buy--mainly special meals at the parks, one being a special cruise dinner at the MK, while you watch fireworks.
In addition to the exclusive experiences The Grand Gathering also offers special reservation services, personalized planning assistance, group messaging at their resort, dining assistance, and the opportunity to pre-order special Grand Gathering options, including merchandise two-way radios. The planners will also help arrange other perks such as floral and gift baskets, special photographs, spa treatments and golfing.
Hope that helps.