What features does the Death Knight class have?

A: Death Knights have many unique features, some of such being:
A jump start to level 55.
A unique and enjoyable starting area, with many amazing quests.

• Access to two class specific mounts, the Acherus Deathcharger and the Winged Steed of the Ebon Blade.
  Diseases as a primary damage source.
  Free weapon enchants that scale with your power.
  A diverse pool of anti-caster abilities.
  Unique appearance, both glowing blue eyes and class specific skin textures are available (although undead do not have access to skins.)
  A unique, chilling voice.
  An innovative energy system, expend your runes on strikes and spells, charge up runic power for devastating abilities!