From the release:
It has arrived, dear players!
Issuing forth the first of our numerous releases for you all, here is the .pdf of the Dark Age Core Rules 2013!
Free for you to enjoy!
...And for those of you who want a more...Physical... Copy, that will be available next month for purchase through our store, as well as quite a number of other...Interesting... Releases for you all!
See you then, and enjoy!