Chest Heirlooms with 10% XP Bonus in Patch 3.2

Zarhym has revealed that you will be able to get chest piece heirlooms in patch 3.2, and that they will give a 10% XP boost that does stack with the boost from the shoulders. So that means, recruit a friend trickery aside, the well-appointed alt can get 10% from shoulders, 10% from chest, and another 100% from rest (at times), and they all stack.