According to a new IGN article here
the new Empire at War expansion will include a definite prequel planet favorite, Mustafar.
Now this is all good, except I hope they arent planning to use the current model for volcanic worlds in Empire at War. From Revenge of the Sith
it is obvious that Mustafar has constant erruptions and that the lava doesnt simply pop around as it currently does in EaW. Hopefully the Mustafar planet will include graphically intense erruptions or at least lava that can explode out of the lava rivers and smash onto units. Anybody agree with me there?