What about Executioner's Outfit?
Nobody knows and you wont get a dev to confirm or deny.
However, these things tend to be staggered through the festival, so I would expect it to appear anytime between now and month end.
According to Reddit’s “I Like Tables” Delsea
The Executioner’s Outfit was introduced 22 Oct 2013 and last returned ~November 2015, so I expect Randulf’s correct that it will be introduced later in the festival.
John Smith: “you should kill monsters, because killing monsters is awesome.”
Ohh I see. Thanks for the reply!