Which is a little strange, when you think about the mechanics of the game. One player mentions the Horde's experience with the necklace in Uldaman-- when Horde try to pick up that necklace, they get an error message (but at least it drops for them). Likewise, Blizzard was able to easily make Pally gear drop on all those Horde runs before the expansion, but they can't flag the Draenei as Alliance? Bit of an oversight, that.
But here's hoping it'll be fixed soon, and the Draenei can be folded back under the wing of the Alliance forces for good.