Found this post on mmo-champion:
"I tell you what: I've always loved DK lore and abilities n stuff like that in wc3 and tft, and thats why I made drastic decision. On 11/12 Im gonna delete all my characters (3x70 and few lowbies) and create a DK as my main. I heard the DK is a pretty difficult class to play, but still fun as hell. I like challenges and it might be a good will training for me (Im a very unstable guy, you know...). DK FOR THE FUCKING WIN!"
Then the next guy answers:
"Be sure to keep atleast 1 lvl55 Char so you can actually create the DK"
I guess it's a bit of an understatement to say that the last guy do have a valid point there...:-)