Set in the eastern empire of Khitai and including a new playable race - the Khitan - 'Rise of the Godslayer' includes a new story and missions, player mounts (like a Tiger), in addition to new grassland, desert, and jungle locations. The expansion also includes content appropriate to, "several level ranges," including a, "wide variety of new low-level content" for fresh characters.

You'll need an 'Age of Conan: Hyborian Adventures' account to play 'Rise of the Godslayer' when it comes out, though a release date has yet to be announced.