27th of November.
Remember this patch is different, its not releasing a dungeon or a raid.
Early December is my safest bet. There are still some features to try out (Domination point isn't available yet as a scenario for instance :P) and not every "game breaking" bug is fixed.... I also am curious about the Wrathion quests, (my monk on ptr got that warlock book from a random crab :P) I do hope for more class specific quests.... OR if they are keeping those quests in the game until 5.2 (As it could work in a way). and then in 5.2 we get the class specific quests.
I think it'll be the 27th. I just dont see them tagging a release candidate and then waiting 3 weeks to launch it live.
Arcane Mage in WoW
Wolverine in Marvel Heroes