I got this from a article on the next expansion pack.

Important Death Knight fact: the Death Knight will not be overpowered just different.

The death Knight will not have a mana/rage/engery system but a rune system. He will have 2 runes with each of his 3 specs (blood, frost, unholy) Each runestone has its own unique abilities and look. Up to six runes can be set together in combinations of different numbers and types. Different spells and abilities will require various rune combinations, depending on the spell or ability's power. The runes enter a cooldown period upon use, but there are plans for spells to restore runes in combat. Each spec like the specs we have now will have a meaing to it. Blood for example will be the damage dealer or DPS for the death knight.

Other Death Knight info

A death knight will fill the role of tank/dps role. They can wear plate armor but cannot use a shield, that's right you heard me no shield. The death knight's pets will be like the mages Water Elemental pets and have a set time they can be out. Like the pally a cross from a warrior and a healer the death knight will be a cross of a warrior and a warlock.
You will be able to make a death Knight once you hit level 80 and complete a quest line that's almost as hard as the warlock epic mount quest. (I have no idea) Your death knight will start around lvl 60 (final lvl hasn't been decided yet) For those of you that have played Warcraft III, and the human campaign, in Stratholme you(the lich king before he becomes... the lich king) kill all the humans that are about to turn into undead. Anyway this will become a new instance in the next expansion in the caverns of time where you help Arthas kill the turning undead people. This will also be the place where your death knight will spawn the first time you log in with him and your first task will be to leave (once again i am not 100% sure it's the article not me).

Info not from the article but from other players.

You will only be able to make 1 death knight per account and only once per set amout of mounths.
You can make a death knight off any class. (gnome death knight :)

Other info on the expansion pack!

Skill cap upped to 450!!!
A non instanced battleground
Customizable hair styles and additional dances for new and existing characters

In the upcoming expansion, Wrath of the Lich King, Bolvar Fordragon will be leading the forefront of the Alliance campaign against the Lich King in Northrend. He may not actually be in Northrend, in the  Quest:Hell Has Frozen Over he is described as having people sent to Valgarde.

    The next Shattrath
For those of you that are wondering what the huge city for Northerend will be... called Dalaran. Dalaran is the city in the giant purple bubble in the Alterac Mountians area. It was destroyed by Archimonde (video of that in the links). Turns out the mages inside were preping it for a MOVE over to Northerend where it will be the Shattrath of Northered. That means its for both horde and alliance. Just like Shattrath it will have a portal to the citys but i do no know about to Shattrath itself. There will be no AH or Class trainer in the city. This is because blizzard doesn't want people leaveing the current citys and having them become a ghost town.

Inscrtiption
The profession of Inscription is similar to the profession of Enchanting. However, Inscription permanently enhances the attributes of players spells and abilities. For example, an "Inscriber" could take the Fireball spell, and give it the ability to daze a target for 3 seconds, or give Shadowbolt a Nature damage bonus, for example 50 Shadow damage, then 60 Nature damage over 10 seconds.

Icecrown Citadel will be the name of the instance where you fight the lich king.

Areas opened to players in the next expansion
Remenber as soon as you are lvl 68 you can hop on a boat to Northrend, no dark portal required. You can use your flying mounts there as well.

Howling Fjord    lvl 68-72
Borean Tundra lvl 68-72
The Dragonblight  71-75
Zul'Drak            lvl 73-76
Grizzly Hills        lvl 74-76
Azjol-Nerud        lvl 74-78
Sholazar Basin        75-78
The Storm Peaks    77-80
Icecrown Glacier      77-80
Lake Winter Grasp    OutDoor PvP

Some nice videos on the death knight
http://www.youtube.com/watch?v=xfgbWwhmVbM
http://www.youtube.com/watch?v=WF_1Pk_4UZk
http://www.youtube.com/watch?v=rbJc_Q9TfGI
http://www.youtube.com/watch?v=I3BxvHhz4XQ

hhahahah
runescape.

lol ya thats what i thought of when i heard of it

wait.......u start at lvl 60???

damn if u start lvl 60 did u think we will be able to redo the quest because I dont wanna farm 20 lvl :(

i bet the quest will either be way too hard and Blizz will  nerf if or it will be a lot easier then expected. Blizz also predicted it would take about the same amount of time to reach 70 as it did from 1-60 and people manged to go to 70 in what like 3 days...i don't remember.

They have stated that if you have a level 60+ character then you will have access to a deathknight.

edit! more info. and like i said the final lvl has been deicided.

Btw.. it is written that it will be as hard as warlock epic mount q.. but i get it when i was lvl 60 before BC and imo same will be with death knight.. easy and expensive.. :P

The whole thing about having to leave is maybe because you have to BETRAY THE SCOURGE to become ally/horde again. Simple.

when u first use your death knight you think to yourself "mabye i dont want to serve the lich king"

it would be cool, if you could stay with the lichking and kill horde and alliance, but at some parts you're united and cant fight e.g.: shattrah, it would be best if you could get the deathknight q at lvl 60, then just lvl to 80 from there :P oh ye, the deathknight will be able to play tank and WONT use a sheild but a 2h weapon, how cool is that?? lol

"..there will be a part where Arthas (the lich king before he becomes... the lich king) kills all the humans that are about to turn into undead.(i dont remenber the name but if you could post it that would be great, starts with a S)"

Stratholme.

kk thx

For all you non Warcraft III players, the humans ate the diseased grain and would eventually turn to zombies and join the undead. Arthas wanted to kill them but Jaina and Uther dissagreed with the mass slaughter of innocent civilians and left his side. Arthas and his loyal followers stayed and killed as many humans as he could before they could be turned undead by either the disease or the death knight Baron Rivendare.

Will it require that you have the Burning Crusade expansion pack inorder to create a Death Knight? If it does, then Bliz better reduce the price to buy Burning Crusade :(

Depends on how they have it set off - so far it all seems like rumors.

If you need to get a character to level 80 and then compelete a long hard quest, then yes you'll need Burning Crusade to first get a character to Burning Crusade.

I bought Burning Crusade a month ago at Walmart for only $20 - might want to check again.

So far everything is just rumors. I've heard you have to be level 80 and do a long serious of hard quests at 80 before it becomes unlocked. I've heard it starts at 60 in Stratholme. Others say you start at level 1. But how can you start at level 1 in a high level instance like Stratholme :P

And if you start at level 1, what would make this character a "heroic class". All I know is you can't use a shield and it'll have some butt kicking abilities. Everything else is just rumors until the game comes out.

But wouldnt a death knight twink be sweet if u started at lvl 1? Though i would rather start at lvl 60

ye, tbh i dont tink it'll start at lvl 1, cause how the hell is it a hero class, but i heard you get the quest to become a Deathknight at lvl 50....

oh, and you will definately need burning crusade cause northrend is lvl 68+ and it's impossible to get to lvl 68 in azeroth

It won't be next month.  ZA patch isn't even out yet.

your guy starts out in strat having to fight his way out at 55-58 i think

Will the Death Knight have it's own mount, like a different version of the skeletal mount, or will you use the race mount, and if you start at 60, will you get your mount free?

No shit how are you supposed to get to level 80?

Some people think you turn your 80 charter into a death knight. The only thing that happens is you make another one just like any other charter only u need a lvl  80 before u do that

expansion is quite a way off

ZA patch hasnt even come out yet and even after that one there is the sunwell patch (5 man instance and 25 man raid) so it will be at least 4 months probably more though

Well,i hope you need to be 80 to get the quest cos im doing a race with my cousin  of getting up to 80 fastest,and if he can only be in lvl 60 or something he will reach me easy

just found out that Northerend will be bigger than outlands by 20%

You make a whole new player that is a death knight your charter does not turn into a death knight and lose 20 lvls

Quest for Death Knight requires 60-eth lvl ,dunno how hard will it be(ask Blizzard :D) then u will tank without shield lol lol and he will be like a mage with plate armor o.O haha i am sure it will be a lot of fun!!!

ok to clear up somethings. It's quest line in level 80
Not 70, not 60... not 37. but in 80.

Also you can travel to northrend in level 1, not 68.
There's no level limit to take the boat. just that quests and monsters are ment for 68-70.

The death knight starts in level 55-70 they havn't decided.

Also the thing with only 1 death knight per account i managed to find as much as nothing, the big 0, nada about.
It's just like the other classes.

(notice to NOW they've said all races can be death knights but they've also said they havn't decided yet.)
Now you press create character, example tauren (yey) we press the tauren race, now here we got druid icon, hunter icon, warrior icon, shaman icon and then death knight icon
(which if you HAVN'T done the level 80 quest will maybe be gray and have the text "Locked" on it, atleast you get the idea) Now lets say we have unlocked it, then it's just normal, color full and no text. You press it then a name ofc and create character. your good!

Now the location it starts is either in the normal race zone OR as i've heard rumors of but cannot confirm is that they begin in stratholme and must get out.