While there is no announcement for an exact date or even which expansion it will appear, Alex "Valnoth" Afrasiabi (lead world designer for World of Warcraft) has finally answered this for us, and that answer is yes. The problem comes down to a matter of finding the right place to fit it in. This might mean something in patch 4.2 or all the way in patch 6.2. It really comes down to when it will fit in the game storyline.
At least we now know that it is something they will do.
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