Tierras Perdidas

George R.R. Martin intended the original short story "In the lost lands" to be the first of a series of stories centered around Gray Alys which he intended to gather and release as a single volume, like his Tuf Voyaging. For various reasons he never came around to finish any more stories, but if the film adaptation turns out to be a hit he will write a new short story for a sequel to be based around.