There is a quest in the profession lines called Trial by Fel Fire. This quest requires the various bracers that can be crafted. Since none of us are likely to be leveling enough characters at the start of legion to handle that on our own we'll probably want to work in the guild to make it happen.
Add a reply to this thread if your main is a Tailor, Leather worker, or Blacksmith. Hopefully we can work to get enough of each item made up when leveling our various professions so nobody has to be use the AH to complete this.