I think the festives this year would be for the class slots that haven't been used yet.
Scout: Mad Milk [or Eggnog, as someone said]
Soldier: Escape Plan
Pyro: Detonator
Demoman: Eyelander
Heavy: [Even more festive] Holiday Punch
Engineer: Wrangler
Medic: Blutsauger
Sniper: Cozy Camper [Or a machete, since there are 2 primary festives]
Spy: Red-Tape Recorder