Setting for the sequel
if we are to follow the trend, it probably won't be a setting covered by any of the games.
IMO it should be hundred years war.
its gritty, the battle scenes would look like game of thrones, and there's a vast, interesting political background struggle going on.
perhaps the main character assassin is a french royal guard and he has to stop a huge english army from crossing the channel.
alternatively i'd love to see a sequel in which fassbender assassin's son or grandson has to go to the new world with cortez and fight aztecs