You can now use spare Garrison Resources to purchase additional Follower upgrade items from Sergeant Crowler (Alliance) or Sergeant Grimjaw (Horde).
New Garrison Visitors
Each day, a unique character may stop by your Garrison and offer different types of quests, which can be completed by you or any friends visiting your Garrison. These visitors will offer new quest types: Bounties, Relic Hunting and Pet Battles. They also offer brand new Dungeon & Raid missions.
Bounty and Relic Hunter follower missions may reward you with new items which you can collect to build a Music Box at your Garrison.
Defeating enemies throughout the world may yield new songs for your Music Box.