Creative Assembly have posted a small Q+A on the Environment we will see in Shogun 2.
There are some interesting snippets such as;
Dense forest will conceal troop movement
Something that I have personally wished for since Medieval II! It will make ambushes even more deadly.
AI has really come into its own with Shogun 2, so I'll have to say that's one of my favourite aspects, the siege battles in particular are a lot of fun. Oh, and the animals...
Animals? Yep. Infact we've got evidence;
Though I'm certain there will be some land animals also, it definitely adds to the battlefield atmosphere so we're glad it's part of the focus. We have a discussion on our dedicated Shogun 2 forum on the topic. Check it out.