Yeah april has been rough regarding lore news. But from now on it should get interesting.
This week or the next one at the latest we will know what 11.1.7 is about, and from that I'm pretty sure that we would be able to tell where are we going in 11.2.
Regarding Ethereals, I think that it is very likely that they become playable even before Midnight launches. If 11.2 is K'aresh, there would be a faction of Ethereals that would help us and eventually become our allies. They could even make these Ethereals Void wielders and link them to a new Void themed class that would (maybe) come in Midnight, in the same way that Pandas were our teachers to become Monks back in MoP.