what sort of shaders ? Mainly an Objectshader, Bloom, and some Vignette/Noise/etc. stuff.
what bitmaps (norm, spec) ? Currently a Diffuse texture, a Normalmap and a Detailmap is used. Later it will be possible to give specular intensity and gloss information in the normalmap, too.
How many dynamic lights ? 8, limited by DX9. With custom light management theoretically unlimited. (as much as Shader Model 3.0 supports)
fixed directionnal light ? You mean the sun? -> yes.
Does it take account of WED sun and light ? Yes, but levelblocks are not supported at the moment.