In ACIV there was an Abstergo email with possible locations for the next Abstergo Entertainment project.
[...]
Patrilineal Line:
Fifteenth Century - Italian Renaissance
Sixteenth Century - Ottoman Empire
Eighteenth Century - American Colonies / War for Independence
Nineteenth Century - New England and American Midwest
Matrilineal Line:
Twelfth Century - Holy Land / Crusades
Thirteenth Century - Egypt and Northern Africa
Fourtheenth Century - Ashikaga Shogunate in Japan
Eighteenth Century - French Revolution
Nineteenth Century - Napoleonic wars; Taiwan
Twentieth Century - "Summer of Love" American Pacific Coast
[...]
http://www.shacknews.com/article/81881/assassins-creed-4-hints-at-the-future-of-the-franchise