I'm calling them that because honestly, I don't know what else to call em. Wraiths? Shades? There's always been creatures like that, but it isnt until recently that we've seen new models for em.
I'm sort of surprised no one has talked about them that much. In my opinion, they are the single most telling proof about what direction Blizzard is going story-wise. Something Death-related is building up, and has been building up for a while. In my opinion, the existence of these models -- meaning more than the usual effort and use of Blizzard resources-- indicates that these models have been developed for future content and are currently being used in everything that is pointing towards that future content.
The ones that attack you when you're on Voljin's spirit quest have some spooky things to say, too.
Trying to find a picture of them without succes sofar. If anyone knows the ones I'm talking about and has an image, please do share.
What do you think?