User blog comment:Master Sima Yi/Assassinews 05-08-'14 – Assassin's Creed: Rogue announced/@comment-24760042-20140823144749/@comment-121.127.205.215-20140824101821

I think parts will be canon like the exsistence of William &  Hattori Hanzō, but they would not reveal much about the customs of Japanese and English assassins.