While the citizens of Gilneas struggle against a curse that threatens to destroy their nation from within, the Cataclysm has presented a unique opportunity for the Forsaken to seize the kingdom for its strategic importance. After striking a new accord with the Alliance, however, the Gilneans will not give up their land to the Horde so easily. The fight to control key locations and accumulate resources will inevitably be waged in an all-new level-85 battleground in World of Warcraft: Cataclysm, The Battle for Gilneas.
http://www.wow-europe.com/cataclysm/features/battleforgilneas.html