Nine legendary cards have now been revealed and in previous expansions we were given 20 new legendaries, so we probably have 11 left. These we know we'll almost certainly get: Y'Shaarj, Yogg-Saron, Cho'Gall and Princess Huhuran.
That leaves us with seven unknown legendaries. What do you think we will get? More corrupted stuff? More minions of the Old Gods? Let's see if there is someone who can get 7/7 right. Reminder: we are missing at least Warrior, Mage and Druid legendaries.