First off, sorry for the late reply. The Old Republic got me distracted a...bit.
Second....Wow, thanks for all the response! Makes us really proud and happy to see you guys are liking our stuff.
Portfolio link is now in my profile.
I'll do my best to answer some questions.
Yes I am : ).
Particles are done by our amazing talented FX team.
For the snow: Most shaders had a snow blend layer which allowed us to paint in the snow using vert colors. On top of that to hide seams, we placed geometry which used a transparency snow shader. Lot of work, but it paid off in the end.
Each artist uses it's own bag of tools, so there's probably a healthy mix of crazybumping/nDo-ing and baking.
We bake our lightmaps outside of the engine.
I'll be uploading some more stuff in the near future, need to grab some more shots