Okay, I just pulled out my map from last year and here is what was open:
Main Street: Casey's Corner, Plaza Ice Cream Parlor, Main Street Bakery, Tony's
Adventureland: Aloha Isle Ice Cream
Frontierland: Pecos Bill's, Westard Ho (quick bites), Fronierland Turkey Leg
Liberty Square: Liberty Tree Tavern (family style character dining), Sleepy Hollow (funnel cakes)
Fantasyland: Mrs. Potts' Cupboard (ice cream), The Village Fry Shoppe
Tomorrowland: Cosmic Ray's, The Lunching Pad (quick bites), Auntie Gravity's Galactic Goodies (smoothies)
Not sure if it's the same this year, but Cosmic Ray's and Pecos Bill's (both CS) should definitely be open. Hope this helps!! Have a great time!