User blog comment:Master Sima Yi/Assassinews 05-08-'14 – Assassin's Creed: Rogue announced/@comment-25186657-20141014204522/@comment-13471981-20141014204804

Judging by the appearance of Achilles, Adéwalé and Haytham Kenway, I'd say it's part of the main series. Also, Ubisoft Sofia only made one spin-off. Way to generalize :s