User blog comment:D. Cello/Assassinews 03/05 -- ACWiki's Fan Section and AC3 first trailer/@comment-98.87.104.79-20120306023553/@comment-1625914-20120306023858

...there's a hidden bladed on his arm, kid. They're probably just not using that ridiculous "hidden blade blocks even giant axes" method of combat anymore and saving it for assassinations, like in AC1.