Unfortuatnly we dont know yet if the taken king will transfer yet. Many in the community eagerly await Bungie saying something on this (either yes or no)
Here is the current info on the upgrade promotion.
https://www.bungie.net/en/Help/Article/12122
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Thanks for the link. I sure hope they decide to continue the program for The Taken King, or at least let us know before the DLC drops. At least that way I'd know to save up for the Xbox One first.