At least 3 areas I have found are showing glimpses of the Spectral Trick or Treaters and the audio file from the new companion. The lines I hear repeated are "Lead the way." and "I am here to protect you." in a deep resonated voice.
The Rewards AgentThe Door by SouthgateThe Door to Protector's Garden If you stand near these locations, you get audio and the ghosts cycling through that don't belong there until the 24th.
Comments
I doubt they will do anything right away to fix it, they have more important issues at hand. There seems to be a whole lot of bugs turning up in the game lately.