WoW Crimson Hall just opened on last Tuesday and Blizzard has already implemented four hotfixes regarding Blood Queen Lana'thel. Here they are straight from Bornakk's post:
Blood Queen Lana’thel will only be available after the Blood Prince Council is defeated.
Blood Queen Lana’thel's Essence has a longer duration.
Kinetic Bombs no longer aggro Blood Queen Lana’thel during the Blood Princes encounter.
Blood Queen Lanathel should no longer cast Vampiric Bite on pets.