I was just thinking.
And what if the reason they are so concerned with making sure WoD releases when it's supposed to, and also that they can't do certain parts of development they normally could, like making Karabor faction hub etc, and there's no new races or classes, is because they are pushing themselves to make WoD their first 1 year Xpac?
Think about it, half the story is gone in questing, dungeons and tier 1.
It would make sense then to have so much important stuff take place in questing like it is. I will not post spoilers outside of saying they made questing awesome, and something you will want to do. And maybe they realised that's how they make 1 year xpacs. Engross you in the questing, and make every second count.
Usually, a huge portion of questing, and even a lot of dungeons are just unnecessary fluff for the game, so what if they just dragon ball Kai it and just let us watch Goku fight frieza all the time?
And then, this blizzcon, they announce first, the big bad of the Xpac, and then the next Xpac, set for release next year? That way, we wouldn't need to know everything about the Xpac, because we won't be doing the same raid for a year before the Xpac. Just have 2.5 tiers per Xpac, having initial release with dungeons and raids, then 1 or 2 major patches with a few more dungeons and 2 more raids. 4-5 raids per year is more than enough for us content wise, especially if there's dungeons involved.
We know this has been something they've wanted for a while, and it really seems like they know exactly what is following WoD, which I don't think has been the case for a lot of the other xpacs, cough cough, cata, cough. I get the feeling most of other Xpacs, if not all, we're just what's something awesome we could do?
Now I think they may have created a flowing story so they know where they are going.
Tl;dr, could WoD be our first 1 year Xpac, and could this years blizzcon announce next years Xpac? I honestly think this is possible.