I noticed that the same symbol we see with Oribos, the snake, can also be seen on the Dark Portal, and the hooded figures look similar to the hood of the Vestments of the Eternal Traveler, which also has the snake infinity symbol on its chest. So there obviously is a connection here. You can see the hooded figures all around Azeroth, even in Duskwood, the Burning Steppes and the Blasted Lands, around portals, altars and a graveyard. They are even seen on the Draenor side of the Dark Portal, even in the WoD Draenor.
Who are these hooded figures and what did they have to do with Azeroth? Are they the ones that pull the strings from the shadows?
Xolartios, the guy that gives you the Vestments, also says something along the lines of when we meet him (in Oribos I assume), those Vestments will be our way of interacting with their faction. Not sure if that is gonna play a role gameplaywise, I actually doubt it, but he said something like that.