Remember a few days ago when I said I would moderate all the fakes on the forum ? [iurl=http://www.mmo-champion.com/index.php?topic=560.msg4284#new]One survived. [/iurl]
Yes, the expansion is World of Warcraft : Wrath of the Lich King. You can stop posting fakes. See you on August 3rd.
Of course this information isn't backed up by any official source, etc, etc, etc. And I personally don't have informations about the Deathknight, I can only confirm the expansion name.
Update : See [iurl=http://www.mmo-champion.com/index.php?topic=564.0]this post[/iurl] for confirmation.