User blog comment:Master Sima Yi/Assassinews 03-03-'13 — Assassin's Creed IV: Black Flag trailer and screenshots/@comment-4360293-20130306031537

Why is this IV? Should it not be a spin off of ACIII. I assume it will have the same engine and mechanics and will be set in the same general time period. Usualy a new number title has a completely different setting.