User blog comment:Master Sima Yi/Assassinews 28-02-'13 — Assassin's Creed IV: Black Flag revealed/@comment-123.100.140.209-20130228141026/@comment-1153722-20130228141226

It has been in development for quite some time. There is not one single studio that works on these games, there are a lot of studios that work on the series, and each on something different.