Unless Disney announces a special paid add-on like Tony's Most Merriest in 2018 or you book a
MVMCP dessert party, the dining reservations during the party are the same menus and experiences as any other day they operate. The quick service locations and snack carts around MK will have holiday options available to all day guests and party exclusive options only sold during MVMCP.
The table service reservation times are listed separately online so it's easier to identify which reservations fall during MVMCP and require separate admission vs day guests.
Slightly off topic, but if you want a "fun" holiday atmosphere and have some time in your trip I would look into the Hoop Dee Doo Revue at Fort Wilderness. It's decorated for the holidays and there are special show additions unique to that time of the year. I wouldn't do it the same night as your MVMCP since it would kill a lot of time, but it's fun. Fort Wilderness also has horse-drawn sleigh rides you can book where you can see the Christmas decorations the campers put up.