If you're referring to Emma's Garden the 'new enemies' is just a reference to the 4 enemies that dwell in that area. They're only marked as 'New' since they didn't exist when the demo launched as it only had one area, The Forest Path.
The two holiday enemies are found inside the restored Khrono Manor. I'd recommend going through the walkthrough for more information. I've updated the walkthrough to include the list of enemies and what Game Over they trigger and if they are currently in game.