A lot of great discussions about content, systems and processes in the forum but, one item I have not seen mentioned yet which is perhaps not nearly as interesting but potentially critical to how quickly the game gains popularity is difficulty.
Surviving in the Neolithic period would have been extremely difficult, as most of nature would be working against you; weather, climate, natural disaster, disease, conflict between tribes/groups, childbirth, infant mortality, famine, etc. I could see scenarios where all of these things combined could make for quite a slog if they were all happening frequently each compounding the other with the unintended consequence of making the game hard to get new players into.
I am curious about how AC intends to create a learning curve which is both challenging and forgiving and also what players are likely to see change at various difficulty levels?