Malthael gets tricked by adrea into using the black soulstone, he ends up killing Ithreal (read the destiny omen), Malthael or Inarious becomes the arch angel of death, and lillith has some part in making this all happen. with the death of Ithreal, imperious fully is consumed in wrath and goes on a rampage to finish of the omen's prediction.
The Prophet was Inarius in disguise. This is taken from the Sin War Trilogy.
I know Uldyssian is a long shot, but seeing that everything is around the nephalem now it seems natural to finally know if he survived somehow or not, in any case, i'm just throwing ideas around, this is the most fun part of the games, the speculation
we're forgetting about Inarius and lilith, they were rogue angels and demons and they messed things up to begin with, so maybe they are the bosses in the expansion.
things I think will take part on the expansion:
The order of the templar, the scoundrel and the thieves guild and the enchantress prophet (probably Inarius) and Dirgest gem (the one Shen talks about) as minor quests.
And as main quests, guiding the storyline:
Inarius, Malthael and Adria
how they can combine all this things? only blizzard knows.
I know Uldyssian is a long shot, but seeing that everything is around the nephalem now it seems natural to finally know if he survived somehow or not, in any case, i'm just throwing ideas around, this is the most fun part of the games, the speculation
The order of the templar, the scoundrel and the thieves guild and the enchantress prophet (probably Inarius) and Dirgest gem (the one Shen talks about) as minor quests.
And as main quests, guiding the storyline:
Inarius, Malthael and Adria
how they can combine all this things? only blizzard knows.