User blog comment:Master Sima Yi/Assassinews 05-08-'14 – Assassin's Creed: Rogue announced/@comment-413232-20140805144635

The additional mission "Siege of Fort de Sable" seems to give us a clue on the game timeline and location, it's a reference to a Siege during the War between the French and the English for the control of Nova Scottia (Canada) around 1630.