This is my favorite essay on these themes, tying together threads spanning from ancient myths to contemporary movies: "The Robots Are Winning!" http://www.nybooks.com/articles/2015/06/04/robots-are-winnin...
One interesting thing I've understood when discussing GITS the anime vs the new movie is that in the anime, Motoko embraces her cybernetic body, so the question is: What does it mean to be human? But in the new movie, Major is the first cybernetic body, so the question is more: Who am I? This an interesting essay by Hideo Kojima about the differences: http://www.glixel.com/news/hideo-kojima-on-the-philosophy-be...
By the way, people into GITS might like this post we made about shots in the movie recreated from the anime: https://medium.com/@gitsost/a-love-letter-to-ghost-in-the-sh...