The New expansion Wrath of the Lich King includes: Level Cap : 80, Skill Cap : 450, Continent: Northrend with 10 Zones, a new Profession : Inscription, Class: Death Knight (first-ever Hero Class) and new Features: Outdoor PVP zone with destructible buildings and siege weapons in both a new Battleground and a brand-new outdoor PVP zone.
The first-ever Hero Class is Death Knight, the first new Class since WoW's lauch. Death Knights have a special "rune sword" displayed beneath their health bar and they rather use this sword than energy, rage or mana.
The New Professsion -Inscription- will allow players to customize spells and abilities in their spell book and to change the cooldown timer.