User blog comment:Master Sima Yi/Assassinews 03-03-'13 — Assassin's Creed IV: Black Flag trailer and screenshots/@comment-257535-20130413220736

I come back to this trailer because of a detail that piqued my curiosity...

The guy Edward stabs at the end of this trailer can very briefly be seen with a cross. That cross is identical to the cross the man in the mask in ACII's cinematic carries.