Of course until official not sure but Touring Plans says:
- Guests who do not want a dessert will now have the ability to substitute that dessert choice for either a side salad, a cup of soup, or a fruit plate. Do keep in mind that this is only available upon request and substitutions may be limited. Guests will not be able to select an appetizer option instead.
It really sounds like the TS locations will have a specific side salad, cup soup or fruit for substituting. I imagine they will be more mass produced. You can not use any appetizers on the menu so that would include the French Onion Soup. If you want it you can use a Snack Credit for it.