EDIT: Looks like I was partially wrong, looks like there will be a lot of nature and tree scaling along with hunting in the snow for this one with some colonial buildings. Color me excited: http://imgur.com/a/3NNkQ
So, I figured that most people are bitching about "what buildings am I going to be able to climb?" in AC III. Well, apparently people only think that American buildings were just two story buildings made of wood, I suppose.
Anyway, here is a list of some buildings they "could" use in AC III for some high-scaling, parkour action. I'm sure they will escalate the scale, and possibly not just use buildings, but the buildings are no taller/shorter than anything in Jerusalem in the 10th century or Renaissance Italy.