User blog comment:JAlbor/Assassin's Creed: Black Flag Q&A Opportunity/@comment-4999424-20130820143314/@comment-4829046-20130820182126

I think the stuff that don't include the modern day part was canon(or then again, it could be since the player is the analyst). It had that strained relationship Ed had with his wife and his reason for coming to the Indies and also how he fist came upon the Assassins. Of course the game's story will be much longer and more detailed.