The latest build for now is in this post: http://www.celephais.net/board/view_thr ... &start=287
The new stuff it has is ambient occlusion (aka dirtmapping), a sun dome feature (_sunlight2), and jittering of the sunlight angle (_sunlight_penumbra).
The good news is, all of that stuff is relatively well documented in the manual

Maybe for the next build I'll try to get screenshots demonstrate each feature, and start a new thread for it so it's easier to find.