Yesterday, I kinda harped on the revealed image for AC3. But I just recently stumbled over a youtube video of a couple of dudes from IGN analyzing all the little details in the artwork. One thing I will give Ubisoft credit for: they are definitely ones for detail. I think the video is worth checking out.
They talk about Native American influences, and delve into the history behind the flags, uniforms, etc., and use that data to hypothesize the time-frame the game will take place in.
I’m not exactly what you call a fan of IGN, but this is good stuff.