The attacks from weapons now become active earlier. this means they detect collisions earlier in the animations, means infantry often hits team-mates stood behind them or two their sides (often out of your line of sight) causing their attack to stop. Makes is a lot harder to group fight now than it used to be. The effect on cavalry is not noticeable, especially for a lancer, and for ranged it does not apply.
Furthermore, there have been changes to the states of many weapons, including greatswords/ poleaxes etc. Changes to the 2h thrust animation and i believe movement speed linked to agility was reduced at some point, although that may just have been a rumour.
