I have 360 and Xbox One. I started on 360 in Feb '15 and bought the expansion pass too. About a month ago I bought Destiny on Xbox One. My characters and stuff transferred fine. You can actually switch back and forth. The progress is logged. The DLC also transferred. The only thing you need to do is go to the destination screen and then select "Purchase" on the DLC. Bungie being Bungie they don't make it too clear. So in order to access and get your dlc to work on Xbox One you just need to click on "purchase" AND THEN it'll give you option to install.
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But you had to buy another copy of vanilla destiny, right?
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Yeah, had to buy another copy of the base game. Fairly cheap nowadays. Got mine for less than $20 new at best buy.
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Ah gotcha :)