I had several ideas for new AC games. However, I just pick a place on earth, and a date in history. Then I think about what happened in the places during that particular time. The game will not necessarily take place only in the place I mention.
I have Asperger syndrome, so there might be a few radical changes now and then.
All dates are according to the Gregorian calendar, regardless of whether the date is before or after 1582, or whether the country had adopted the Gregorian calendar or not.
As it is now, I would have made games until Assassin's Creed XII.
My game ideas:
Assassin's Creed IV.
Assassin's Creed V. January 3, 1708. Tel'manove, Donets´ka Oblast´, Ukraine (47.40994, 38.02476) The Great Northern War, Cossack rebellions, Czar Peter the Great
Assassin's Creed VI.
Assassin's Creed VII. July 10, 1866. Réauville, Drôme, Rhône-Alpes, France (44.43333, 4.93333) The Second French Empire, war with Prussia looming at the horizon, the Paris Commune
Assassin's Creed VIII. June 7, 1669. Pilham, Lincolnshire, England, United Kingdom (53.43367, -0.70383) Restoration Era in England, right after the Great Fire of London
Assassin's Creed IX.
Assassin's Creed X.
Assassin's Creed XI.
Assassin's Creed XII.
Note: I started this list before it was revealed that ACIV will take part during the piracy era