So Death Knight?

Where did this actually come from? seriously, ive been thinking lately ofc with wotlk beta here who just woke up one morning and decided to chuck in this class from nowhere?!

WE HAVE mighty warriors!
Amazing Mages
Sneaky rogues

and er? yeh Death Knight...

It just looks like blizzard got bored and chucked it in from nowhere for no reason... what makes it funnier every race can be one too? yeh thats right shamanistic taurens are now DEATH KNIGHTS!1!1 and it starts at level 55!? = massive wtf

I dont get it someone please clarify why this class is being put into game it just seems they couldn't think up anything better and made something to keep the 12 year old happys with teh udneadz mount and teh glowing eyes!1!1