Update: There will be thirteen new bosses according to wowhead
Earlier today the World of Warcraft team provided us with an image and a name for the upcoming Patch 5.2 raid dungeon "Thunder Isle". The dungeon is located on a large island - you can see it in the north west on this map.
Now many questions come up in regards to this sneak peak as for example: "When will the dungeon be released?" or "How many bosses will it have?" - Let us know your guesses!