Well in the horde broken shore side, vol'jin is alive, and he dies in the quest after the broken shore from wounds sustained at the broken shore...
Then they have his funeral.
So he's dead dead.
We might see varian die in the cinematic I imagine, I do believe they will die for good. I don't think they'll be brought back in the last patch, it's just a stupid idea and bad story writing, kill them off and make their deaths meaningful.