Hearthpwn

So during the final encounter with Tekahn, he casts a 10-Mana spell in phase 3 called "The Final Plague" or something of the sort.
When he plays it, it summons all four of the Old Gods from WOTOG. After defeating him, we see the explorers interact saying "The Final Plague is unleashed? What did he mean by that?" And then, Brann replies, "I get a feelin' this ain't over just yet." 
The way this looks is they're bringing back ALL the Old Gods, as Tekahn unleashed them during the encounter, and current WoW lore is actually having something similar happen. 
This could just be something for dramatic effect, but I think that's unlikely as during the fight with Ol' Toomba in the Dalaran Heist, if you played Elise against him, he'd say: "Elise! Thought you was out in the desert still?" Which gave us a slight hint of what's was to come. Now it seems they're not being as subtle this time, but maybe i'm reading too far into it.
What do you guys think?