There's not a _ton_ in there yet, but I have started mapping out some of the major design points in the wiki located here:
https://wiki.shadowsofillumina.com (https://wiki.shadowsofillumina.com)
It's read-only, and probably always will be, as it serves primarily as a way for me to organize the design of the game outside of an eventual 10,000 page document. It's mostly going to contain descriptions of continents, zones, NPCs, some backstory/lore, etc. However major plot points will not be posted there (at least, not publicly accessible) until sometime after the game's release. No spoilers!