No, Warlords and Mists had no hint ingame, I mentioned in the post that the reason I believed Azshara would be coming after those expansions was because of the Dark Below trademark and the fake Eye of Azshara trademark. So every expansion there was something that made a lot of players go "Azshara is gonna be next". How much credibility that had doesn't really matter. We all know that in all of these cases, Azshara didn't make it. But a lot of people believed that every expansion after Wrath was gonna be Azshara, and they at least always had some reason to believe it.