I'm not sure if it's the same sandwich but the one from Pizzafari is delicious. The menu section on the WDW site describes it as:
Hot Italian-style Sandwich This Mouth-watering Sandwich features layers of Ham and Turkey, Fresh Lettuce, Juicy Tomatoes, and slices of Swiss topped with Pesto and a Caesar Dressing. served between two toasted slices of delicious Muffaletta Bread, with your choice of Carrot Sticks or Chips.
Not sure either..but it IS delicious!! My fiance and I always try and split it with a pizza from Pizzafari, but it never works out. I always end up eating most of the Italian Sandwich.
Maybe we should start getting 2...