I remember that in the last round of interviews, they said that we will see some void and light conections with the dead, and I got to remember these 2 Naru from the game, K'ure and D'ore, one is below Oshogun and the other in the Auchindoun, and when they got drought from the light, somehow turned void, but they kept the souls from the dead still walking with the living, many orcs seek knowledge on the spirits on Outland nagrand... well, basically they somehow can keep the dead walking among us and keep them from going into the Shadowlands...
And I want to know, do you think we are going to see some of this? or this is a mere coincidence and also the warcraft devs forgot it... I mean come on, its interesting to explore on it...
---- Edit.
We also know that in Draenor Shadowmoon Vale, Nerzhul and some other shadowmoons commune with the dead, and also that Nerzul was the lich king... if you think this could imply something for Shadowlands, for a patch, let me know.