Yes seriously. While the horde are deciding a new leader and the alliance is heading back to their places via boats(which could take weeks if not more) Lord Kazzak will appear once again and starts summoning the legion... we kill him and his minions and then head through the portal he created to the next expansion... and this all happens in 5.5 What is problem ?
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Yeah and how it's related to the fact that the mists dissipated right before the legion would attack in order to allow the pandaren to join the battle after they mastered their emotions like Shaohao did, and also allow other races to come and learn those lessons just in time for Legion attack.