Is it Permanent?

There have been many questions in-game about the loot that the Headless Horseman drops. Turns out, as per this post by Drysc that yes it is all permanent (other than the brooms).

Heh, no, they're permanent.
The event designers wanted to incorporate some item rewards, some decent epic items for completing the end-quest for a holiday event. Something that is likely to continue into other events. It's certainly easy, puggable, and it gives some decent items. It's a fun event, and the fight to the portal in/around SM is a hoot. Enjoy!