One of things that I had heard was that a forum poster on 4chan (I know, I know) was apologizing, because the ruleset was the one his group had developed and used. I sort of believe this, due to the preface of the document, as well as the mish-mash combination of rules seemingly taken from other games. I don't know if I can post it here, but I'll err on the side of caution and not, at least at the moment. But from the preface, it seems that the document takes 5th edition as the base rules, and then adds on it's own 'advanced rules'.
Another rumor that apparently went through GW HQ is that false documents were going to be released to see if anyone was leaking information.