(all information taken from wikipedia )

the sequel to Relic Entertainment's Homeworld from 1999. Taking place 100 years after the original game, it concerns Hiigara's response to a new threat, known as the Vaygr. It features enhanced graphics and brand new audio, and its gameplay takes a new direction: Vaygr and Hiigaran ships differ significantly in design and application, as opposed to the near-identical Kushan and Taiidan forces of the original game.

Homeworld 2 was made in late 2003, but shortly after, Relic Studios was bought by THQ, a direct competitor of Sierra and Vivendi, who still own the Homeworld license. Therefore, there is a very low chance of any more Homeworld games being produced. A personal falling out between Relic and Sierra staff just prior to the THQ purchase also dashed any hope of further games being made.

There has been a rumor circulating around the internet, mainly the RelicNews forums, that Relic has reacquired the Homeworld license. This rumor was sparked by an article in an issue of Game Informer magazine. (Issue 158 (June), Page 30, upper left hand side.) Relic staff have yet to give a definitive answer on the subject.

Homeworld 2 continues the epic struggle of the Hiigarans and their leader Karan S'jet. Many thought their hardships would end when they returned to Hiigara, yet fate has not been so kind to the Exiles. Now the Hiigarans face a new and bitter enemy, a renegade clan from the eastern fringes of the galaxy, who wield the power of the ancients. Homeworld 2 chronicles the valiant journey of the Mothership and its crew into the oldest regions of the galaxy to confront their new foe and discover the truth behind their exile. Through the 14 missions, the Pride of Hiigara will lead a fleet to find and awaken Sajuuk, the creator of the Hyperspace Cores, in a final attempt to save their Homeworld.