When Cataclysm launches in 2010, the Horde will be gaining their very own shorter than average class of crafty, intelligent creatures in the form of the Goblins. The shift from a largely neutral race that has been in the game from day one as a group of traveling merchants to a more active, combat oriented race has many players eager to learn about the lore behind the Goblins joining the Horde.
What ultimately pushes the Goblins into the arms of the Horde is the upheaval of their island homes by the return of Deathwing and the Cataclysmic events that force them to the Lost Isles. While the playable Goblins will only represent one faction of the race (other Goblins will remain in cities like Gadgetzan), they will not be the same, little green guys everyone knows and loves.
