Datamining must always, always, always be taken with a pinch of salt, and in this instance we'd actually recommend a whole bag of salt. But nonetheless, it is fun to speculate, and this sort of thing has happened in the past and actually turned out to lead somewhere. Back in 2007, WoW Insider's Eliah Hecht reported on
a section of the PTR client called "Howling Fjord", and wondered whether this might link to some future expansion taking place in Northrend. Guess what happened?
And now we have word that there is a new item under expansion05 on the PTR client. For clarity, as far as we know, we are currently on expansion number four. Again it's worth taking all of this with a very large pinch of salt, but while the file itself is simply a bit of grey stuff
, the name of the folder it's in is "Iron Horde
", and its name is nex_envmap01t.