Let's be honest here. The voice actor of your ghost, Peter Dinklage, is [i]not[/i] coming back to any of the smaller expansions.
Why, you ask? The evidence we have as of now is Eris. A different less well known, and less expensive, but still talented voice actor voiced this character (I'll look up who it is later). More than likely this will be a pattern for future Destiny content besides comet, which really... Who can say what will happen with comet.
But Peter Dinklage has his busy schedule with Game of Thrones, and unless Bungie hasn't already worked on his voicing it's not gonna happen for these smaller expansions like Dark Below and House of Wolves
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People can complain about his voice actor but he played the part of a ghost, basically a machine that can talk. If they wanted Tyrion then they should of directed him that way.