User blog comment:Master Sima Yi/Assassinews 08-02-'13 — Next game will be all new, plus DLC promotional material/@comment-3168501-20130209221316/@comment-5413627-20130210035926

His not so supreme presense has given me a source to share, granted it's not very official.

http://www.gamnesia.com/news/rumor-assassins-creed-iii-dlc-or-assassins-creed-4-to-be-titled-black-flags