I think this spoiler is the "lie" referred to by one of the first conversations I posted that speaks of Ashvane. It's unclear whether or not it is actually a lie or whoever is speaking in that conversation just thinks it must be, though.
Unknown_Female: We had a deal, Azshara! Give me the power you promised!
Unknown_Female: Oh, I intend to. I merely wanted our guests to bear witness to your glorious ascension.
Unknown_Female: No! Not like this! What are you doing to me?!
Unknown_Female: You asked to be powerful, Priscilla. Consider our bargain complete.
Unknown_Female: Puppets... fools. The Banshee baited you... to your own slaughter.
Unknown_Female: Gave Azshara... what she wanted. N'Zoth will rise... his madness... comes...
Unknown_Female: Ashvane spoke with a serpent's tongue, but... could she be right? Were we lured to Nazjatar as part of some dark bargain?
Gonna guess this will be the big debate around the broadcast text until we find out more: is this a lie or not?