http://www.slashfilm.com/j-w-rinzler-the-making-of-star-wars-the-force-awakens/
I would love to read Lucas material for the sequels (postlogy ? Anyone ?). Rinzler’s making of books of the OT are great (still need to finish ESB and to begin ROTJ, but I assume it’s roughly the same quality as SW); I hope he will someday do the same for the PT (and both Clone Wars tv series ?).