No, it won't happen. As much as I would like a fourth spec, it just won't happen because Blizz are being extremely thrifty in what regards Shaman design, in my opinion.
But, for anyone interested, I created a sample Mists of Pandaria-style progression of how it could be, because I do believe it is quite possible.
Check it out here. Then come back and tell me how much you'd love Ancient Glaive.