Wrath of the Lich King will introduce a vast new land and many new dungeons to the game. A multitude of strange and terrifying creatures inhabit the frozen continent of Northrend, and you can now catch the first glimpses of the denizens of Northrend on our new Wrath of the Lich King Bestiary page. This page contains a sampling of the many new monsters you will encounter as you venture deep into the forgotten lands and desolate wastes of the Lich King’s domain. The Bestiary will be updated regularly, so make sure to check back often!
Original post by World of Warcraft Community Site