Obviously Death Knights have been part of Warcraft since the days of goblin sappers and Paladins. Blizzard has stated that they are really looking forward to reviewing past DK abilities and integrating them into the new hero class.
So I got to thinking what past deathknight abilities do you really want in the expansion? Which of the previous abilities are going to make an appearance and how might they be modified for the new class?
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Warcraft 2 Deathknights (info from wowwiki):
Death Coil (kills target unit, damages a neighboring unit and heals the caster)
Death and Decay (ranged channeled AoE damage)
Raise Dead (raises skeletons from corpses)
Haste (temporarily increases movement speed of target)
Unholy Armor (lowers target unit's HP and grants it temporary invincibility)
Whirlwind (summons a whirwind that moves around randomly to deal AoE damage)
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Warcraft 3 Deathknights (info from battlenet):
Death Coil (A coil of death that can damage an enemy living unit or heal a friendly undead unit)
Death Pact (Kills a target friendly unit, giving a percentage of its hit points to the Death Knight)
Unholy Aura (Increases the movement speed and life regeneration rate of nearby friendly units)
Animate Dead (Ultimate - Raises 6 dead units in an area to fight for the Death Knight. Animated units are invulnerable)
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You'll also notice that the Death Knights in both Warcraft 2 and Warcraft 3 are shown mounted. Noteworthy here if only to speculate if the death knights will have a summonable mount like Paladins and Warlocks.
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WoW NPC and Boss Deathknights... way too many different bosses and abilities to list here but feel free to add.
Edited, Apr 16th 2008 12:55am by Mehdik