It is, here is a quote from wikipedia (I know it can be wrong but just bear with me)
"On April 5, it was announced on the game's website that an expansion will be made for the game. No release date or extended details were revealed, but they have confirmed that the expansion pack will have a campaign mode. The expansion will also have more technologies, among other yet to be named additions. It was also hinted on the site's online message board that the identity of the unknown race hunting the Vasari will also be revealed, though whether or not they will be a playable race remains to be seen, should they be revealed."
