EA has said no Scrin though, but the Mutants are back apparently.
TBH, I think Tiberium Wars jibed better with the feeling I had left over from Tiberian Dawn. Of course I didn't like Tiberian Sun much at all, it was, compared to the first one, a really rather poorly made game with a horribly disjointed narrative and bad game play, it may have been better in multi, but back then I didn't multi and could barely keep my head wrapped around the story. I only played it the one time and I don't really remember what happened other than a supposed impaling of Kane.