User blog comment:Master Sima Yi/Assassinews 19-07-'13 — Assassin's Creed: Brahman announced/@comment-2.29.234.2-20130821120729/@comment-13471981-20130821131408

I somehow doubt this will be the main antagonist. Previous games liked to keep their big bads hidden for quite some time, barring Cesare, who was really eager to get a blade to the throat. Either this Grand Master dies somewhere in the beginning and is replaced by another, more mysterious fellow or Ubisoft has gotten really spoiler-y with their promotional campaign.