Not been impressed by anything I've seen on this expansion, and I'm baffled that a major selling point is the expansion theme, which is completely pointless. There's no drama with an Alliance vs. Horde war, ever, because it can only end in stalemate. If it doesn't, Blizzard pisses off 50% of the playerbase.
So basing an expansion around the weakest possible theme is bizarre.
Blizzcon is the attempt to sell the audience on the idea, and what Blizzard has put out has seemed extremely lacking in details, and with an extremely weak theme.