Vex Void. I have a theory it'll be about Europa. [spoiler]Would actually fit VERY nicely. Cayde's journal in the CE mentions something about a place "colder than Saturn" - in particular it's a moon. Since Phobos (-112C) on Mars is not colder than Saturn (-168C), we're talking about a completely different moon (not in this DLC). Europa fits very nicely (-220C). Excerpt: "Suddenly, I aint so mad anymore. Saturn. No, someplace else. Someplace colder. This moon has been almost completely [b]converted[/b], a SARCOPHAGUS of ice and iron. Stone towers run round with glaciers, rooted deep within a heart of snow." If we still go by the previously leaked DLC timeline (despite it's minor inconsistencies) Then we can assume Europa is also "converted" by the Vex - kinda like Mercury, and will go hand in hand with the timeline which is supposed to be a Vex DLC next - Vex Void. Though I could be way off... but I think Bungie is secretly telling us through the CE[/spoiler]