I don't think they'll announce yet how much they're going to charge for each armour set. This transmog is to make cash. There is no reason why this cannot be free in game, no real money involved.
Or at the least those that are FTP model can pay, those that have paid money for the dlc get it free.
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I agree, they are nerfing how we get Bright Dust next Season. They are pushing Silver harder.