Plots within plots and schemes within schemes devolve the crew of the Wandering Wrath into mistrust and outright mutiny, and all the while the lives of the islands' innocents hang perilously in the balance. The ship's notorious captain is a man so cruel and vile, he is said to have been born without a soul. Yet it is often true in the murky underbelly of the harsh seas, that things aren't always what they seem.
There are all-new races and bosses who lurk in the depths of the unexplored islands. Brilliantly flavored with stunning new cut-scenes, the 12+ hours of main quests await the player, permeated with twists and surprises at every decision. Dozens of new weapons including the crossbow, permanent potions and new armor accessories to increase the hero’s stats, effective horse armor, as well as fresh fighting techniques will provide the perfect means to get an all-new experience in the world of Antaloor. -Publisher
It features new animations, new recorded dialog, customization options, and new map area with a 10 hour campaign. It will also include 4 new multiplayer maps.
Source: Wikipedia, "http://en.wikipedia.org/wiki/Two_Worlds_II#Expansion_Pack," available under the CC-BY-SA License.