Via World of War: "I've put together a complete guide of all the quests and activities players go through when they make a Death Knight. There's around 5 hours of play before Death Knights join the rest of us on the regular servers, and it's all been documented and captured in screen shots.
Blizzard has done a great job thinking up unique ways to introduce a player to a new character, and ensuring people stay entertained through the whole experience. There are several new game mechanics in this part of the expansion alone, and players will definitely not be disappointed."