Well, it appears as though the "third" WotLK leak is here.
To the left, you can see a photograph of the box art for the Wrath of the Lich King Collector's Edition. The art really isn't a whole lot different than the Burning Crusade Collector's Edition. Now, it could be a photoshopped picture - the collector's edition would be an obvious choice to try an fake over the regular edition's box art (Blizzard has a thing for character's faces). However, even if this is a faked creation, I really don't think it will be any different from the actual box art.
Well, there isn't a whole lot to post on this, so I'll leave you with that. Just enjoy pondering over the awesomeness of what will be the Wrath of the Lich King.