Here's the info Disney e-mailed me when I asked the same question:
BREAKFAST INCLUDES CHOICE OF:
* One (1) breakfast entrée, one (1) bakery item, one (1) juice and one (1) coffee or tea per person
OR
* Full breakfast buffet per person
LUNCH INCLUDES CHOICE OF:
* One (1) appetizer, one (1) entrée, one (1) dessert, one (1) non-alcoholic beverage** and one (1) coffee or tea per person
OR
* One (1) combo meal (entrée, side dish and non-alcoholic beverage**)
OR
* Full lunch buffet per person
DINNER INCLUDES CHOICE OF:
* One (1) appetizer, one (1) entrée, one (1) dessert, one (1) non-alcoholic beverage** and one (1) coffee or tea per person
OR
* One (1) combo meal (entrée, side dish and non-alcoholic beverage**)
OR
* Full dinner buffet per person
Children ages 3 to 9 must order from the childrens menu where available. Children under the age of 3 may share from an adults plate or a meal may be purchased separately a la carte from the menu.
BTW: We had planned on doing the gold plan with a family of four for 10 nights and discovered after a lot of research that we would save more than $2000 if we just bought our own meals and entertainment. Three meals a day at good restaurants is a LOT of food and wouldn't leave you much time for entertainment or tours, etc. Might be good for your family, but we figure even two sit-down meals a day could be too much. And if you're using the Gold Plan for places like Casey's or Cosmic Ray's, you're wasting your money.