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.