Blizzard needs something to bolster Q1 and Q2 of next year. If they have nothing in store it will be their worst quarters in a decade or even more than that. Blizzcon will show us their future plans and they better be good.
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Where? The Azshara stuff and we freeing him? lol that's almost nothing compared to how many set up other stories have. And with the entire death / Sylvanas + Azshara / N'zoth stuff it doesn't make sense to start it in 8.3 and finish it in 8.3. It's just too much of everything right now. Plus you'll have the aftermath of 8.2.5 in it as well.