Base for every title is the BD - unless the HDTV has better image or bigger frame (it happens in EP1).
Adywan’s will be used for some shots; even if upscale would be not as good as real HD, the improvements in comparison to original footage would more than compensate for this.
Unused footage: as these will not be enhanced, I don’t see the point to include them, as they are available in the respective DVD, BD or ebook.