In the Adventurer's Guild there's the pdf of the Beta 2.3 version of the rules. To obtain it, you had to buy the basic "red box" version of the rules, playtest it and report the actual play.
However, currently sage & adam are finalizing the game and soon enough (late July I think) the definitive pdf will be available to everyone (along with the printed book).
You can read the github files in this way: download them, change their extention from .xml to .html and open them with your browser. It's not perfect but it works.