Trials of Osiris (Skirmish): 3v3. You have caught the eye of Osiris. Venture to [b]Mercury[/b] and prove yourself as one of the Crucible’s elite. Only the worthy may face the Trials of Osiris, for only the worthy are strong enough to endure what is to come. A string of victories will earn great rewards – but lose three times and you’re out. Source: http://www.dualshockers.com/2014/07/27/destiny-a-list-of-all-the-missions-strikes-areas-raids-crucible-maps-and-more-discovered-for-now/ Trials of Osiris seems to be an event, much like the Iron Banner if I had to guess. And Mercury was mentioned within the game itself, in the prologue.

Yeah, i think you did. Venus is closer to the sun than earth, but not that close. Not only is there an entry on it, they specifically mention building colonies on Mercury in the intro.