User blog comment:Master Sima Yi/Assassinews 05-08-'14 – Assassin's Creed: Rogue announced/@comment-95.176.185.71-20140913162809/@comment-13471981-20140913171000

Marketing is a large part of selling copies. I'm fairly sure Assassin's Creed III outsold Black Flag, but out of the two, I'd argue Black Flag works much better.

Also, just as a word of warning, expect a polished game out of Unity, not Rogue. Unity has got the budget and the amount of teams going for it - Rogue will be cutting corners where necessary. It's not like this is new either; Liberation used a lot of animations from AC3. It's basically the same scenario.