I was flipping through some sound files (originally trying to find the TF2 one for ellis) and found some other sound clips in the dlc folder, mentioning a snow storm and a train station. Don't remember either of those in the new dlc. Does this mean that it's for another dlc or just there for someone to use in any community made maps?

If you want to find them they were in C:\Program Files (x86)\Steam\steamapps\common\left 4 dead 2\left4dead2_dlc1\sound\player\survivor\voice for me.