And? When Blizzard announced Warlords they said that the Iron Horde storyline was going to be wrapped up before the end of the expansion. (Actually it may have been immediately following that Blizzcon, I believe it was Chris Metzen who said it?)
We'll just have to wait and see. I'm confident enough that WoD isn't done after 6.2 and that more content other than filler will be released. And hey if I'm wrong I'm wrong, but I doubt it very much.