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That's 12 hours for us in the EU, US have to hold on a little longer.
As always mmo-champion has a great summery of all the new zones, dungeons, raids, gear, bosses, world bosses, senarios, factions, profession and class changes and so on http://www.mmo-champion.com/content/
I wont be jumping in at midnight as I have for previous expansions but I'll be there tomorrow after work.