Apparently the fastest leveling specc is the AOE - unholy specc, which basicly makes you able to run into a crowd of 5-10 mobs and just gib them all down uber fast. So the dk race is gonna be about dominating the aoe zones. Which i expect the people wanting to roll dk will do, and fast.
If you have any questions or if there's something you'd like to find out about the class i suggest you visit this awesome forum that i came across a few weeks ago:
deathknight.info
I't brings up the most commonly asked questions aswell as shares speccs and dps rotations.
GL