[douglas]

With all the books published and officially recognized as canon, he'd just about have to either use the plot of an existing book trilogy, skip several very eventful decades, or cover a drastically less important/more obscure plotline than anything in the first six movies in order to make a sequel trilogy. If he ever did have an outline for movies 7-9, either it's already been published in a trilogy of novels or it flatly contradicts a substantial amount of now-official canon.