WOTLK

aka Wrath of The Lich King, I seriously can't wait for :D with all the new improvements and every raid being 10/25 man along with I would assume the 10 mans will be 1 Tier less then the 25 mans but I'm just assuming there, anyways vehicle combat ftw especially air vehicle combat :D, also Lake WIntergrasp all of its pvp that will have some crazy ass times/games :), just can't also wait for Naxx since there will be a new 4th Horsemen since Highlord Mograine is out due to him being good so to speak ;) and in the 10 man of the 4 Horsemen it will be interesting because non-traditional tanking will be used, IE-Mage for that one dude in High King encounter and also Warlock for Letharos (or however you spell him)