User blog comment:Master Sima Yi/Assassinews 19-03-'14 – Two Assassin's Creeds for 2014?: Unity and Comet/@comment-4333212-20140322154117/@comment-1379990-20140322173716

I think they don't want Roman Numerals in the title, so that they don't have to restrict themselves to a specific order. After all 'Comet' is also coming and we don't know if that is going to be a spin-off game, while this one is in line with Black Flag. They could be both linked to it, yet have separate stories.