It's certainly not official, but the most recent 'published' (err...) version of my (with tons of extra peoples' inputs and suggestions) Demiurg rules and lore (for Inq, BFG and E:A) has just been linked to in the Experimental Rules bit.
As I say, it's not official, but (I, obviously, think) it's interesting and I'm hoping to streamline/improve them within the next wee while.
(All of) Your thoughts and comments would be most welcome!