Wrath of the Lich King: How Does the Death Knight Fit Into the Dungeons/Raids?

The Blizzard team shed a bit of light on the role the Death Knight is meant to play in a dungeon or raid setting come Wrath of the Lich King. Essentially, Blizzard told us that the Death Knight hero class is meant to be a viable tank at both the dungeon and raid level and also viable dps if a tank is already available.

However, they assured the audience that the Death Knight is not intended to replace any particular class. They simply want to encourage more players to play tanks, as more tanks lead to more dungeon runs.