To quote the LoGaS Kickstarter,
Lords of Gossamer & Shadow is a stand alone game using Erick Wujcik's diceless rules system which powered Amber Diceless Role-Playing.
From May 15th, 2013 (the Kickstarter closing date) to sometime in September, I expect the LoGaS rulebook publication project (with extra stretch goodies) to be in progress, and according to Steve Russell's updates, to be available at retail in early 2014.
Steve Russell (publisher of Rite Publishing) has opened up discussion forums
on his site, which you can read (and register, if you want to participate).
Rite Forum Index
Public LoGaS Forums
Note that as of 2017, the Rite Forums below are under migration and reconstruction.
See instead: The Google+ community for Lords of Gossamer and Shadow