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The Dark Below is a place in the wow universe, next to Nazjatar, where N'zoth sleeps: creator of the Emerald Dream/Nightmare
That one sentence is already a better premise for an expansion than WoD - and we already know N'zoth woke up - because Yogg Saron kept trying to tell us he was waking back in WotLK. N'zoth is the old god who masterminded the corruption of Deathwing in Cata, and even the Mantid were hinting at a coming battle between Y'Shaarj and another old god (N'zoth by process of elimination at this point) - which is why they thought they were returning to his service.
For three expansions now they were building up N'zoth as the prime old god - and then they just drop it to go chase orcs in the past, just so they can tie in with the movie (which presumably consists entirely of orc warriors). I am dissapoint