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Where do you think the final showdown with deathwing will take place? There isn't a set place like icecrown citadel or black temple.
I'm not sure we've gotten definitive word from Blizzard where Deathwing will be, but given that we got whole new zones (or at least instances) for the end bosses of BC and Wrath, I anticipate that wherever it is will be shiny and new when we get to see it.
Some commenters suggested even deeper in Grim Batol, or Northeron, the only currently unavailable zone on the world map. Lord Daval Prestor, Deathwing's old human form, had claimed to be from that area back when he was messing up politics for the Alliance.