The Worgen race is a new playable Alliance race introduced in the WoW Cataclysm expansion. Outside of combat, Worgen can appear both as a Human and in Wolf Form.

Worgen Available Classes:
Warrior
Hunter
Rogue
Mage
Priest
Druid
Warlock
Death Knight (Unlocked only once you own a level 55 character)

Worgen Racial Abilities:
Aberration: Resistance to Shadow effects and Nature effects inceased by 1.
Darkflight: Acrivates true form. Movement speed increased by 40% for 10 seconds. (3 mins cooldown)
Viciousness: 1% increase to critical strike chance.
Flayer: Skinning skill increased by 15. Skinning takes 0.5 secs faster.
Two Forms: Switches between Human and Worgen form when not in combat (When in combat, you will be in Worgen form)
Running Wild: Instead of Worgen Racial Mount. Increase movement speed greatly.

Worgen Languages:
Common

Worgen Starting Location:
Gilneas City (Levels 1-5)
Gilneas (Levels 6-15)

Worgen Faction:
Gilneas

Worgen Mount:
None (Racial ability "Running Wild" instead)

Worgen Base Stats:
Strength: 23
Agility: 22
Stamina: 20
Intellect: 16
Spirit: 19

Warrior:
Strength: 26
Agility: 22
Stamina: 22
Intellect: 16
Spirit: 19

Hunter:
Strength: 23
Agility: 25
Stamina: 21
Intellect: 16
Spirit: 20

Mage:
Strength: 23
Agility: 22
Stamina: 20
Intellect: 19
Spirit: 21

Priest:
Strength: 23
Agility: 22
Stamina: 20
Intellect: 18
Spirit: 22

Rogue:
Strength: 23
Agility: 25
Stamina: 21
Intellect: 16
Spirit: 19

Druid:
Strength: 24
Agility: 22
Stamina: 20
Intellect: 18
Spirit: 21

Warlock:
Strength: 23
Agility: 22
Stamina: 21
Intellect: 18
Spirit: 21

Death Knight:
Strength: 111
Agility: 75
Stamina: 99
Intellect: 25
Spirit: 41

Best class for Worgen:

Druid: The 1% increase in critical strike, along with higher base strength and agility, makes the Feral Druid an attractive choice for the Worgen.

Rogue: Increased critical strike chance allows for massive damage.

Warrior: Higher base strength, along with the Aberration resistance, makes the Worgen a good candidate for a tanking class.

Hunter: If you like to solo, choose the hunter class. Higher base agility, along with long range attacks and a pet companion, increase your solo survivability greatly.