User blog comment:Master Sima Yi/Patrice Désilets leaves Ubisoft once again/@comment-5174994-20130515184736/@comment-4868246-20130523165010

Reply to The.Outsider: Technically, all AC games (except 3) reused previous animations, AC2 added a lot but recycled just as many. However AC3 suprisingly did not use any previous animation (except iconic ones like the leap of faith and basic ones like swimming).

But I believe there are many new animations for ACIV: Black Flag, perhaps this is all pre-alpha footage without many of the new animations :/