From Goatmeal on the Sierra Help forums:

Some minor changes, and revised the “fan fiction/enhanced ” cutscenes yet again — cleaned up the writing to make it flow better. The major change was now there is a Version Update log at the end, and includes where the most recent version of the PDF can be found.

This is likely the last update; there won’t be another one unless something earth-shattering happens, like Peter Sarrett or Cynthia Vanous contacting me with new information or to tell me I’m wrong about something. I wrote a physical letter to Peter in care of Bungie Games in Seattle a month ago, but there has been no reply yet. I’m not even sure he received it; you know how big conglomerates can be… Cynthia used to have a blog post, but that’s been gone for a couple of years