If anything the races will be Humans and Orcs.  They might let everyone be one though, who knows?  I personally think once you are a death knight, if you take off all your clothes you are just a skeleton.  Makes sense, I mean look at the pictures of Arthas in the background on the Death Knight page on worldofwarcraft.com.  It's a skeleton with long white hair.  I am also pretty sure that you trade-in your character for a death knight.  I heard Warriors who trade-in for Death Knight will be able to dual-wield 2H Weps.  It's called "Titan" supposedly.  IDK tho, just wait and see.

a death knight starts in the middle of lvl 50 so how the hell u can turn in a 70 or 80 class.
and 2 2hs is impossible he dont have or get 4 arms.