A lot of armors have had their stats adjusted and have been moved around between the different class tiers. This will hopefully make the different classes stand more apart in the fashion department. Every tier you unlock new armor the armors have been given flat stats as well, so you can freely choose between different looks without taking a hit to stats!
Archers have had their overall armor values decreased and Cavalry has been put in the middle of Infantry and Archers armor wise.
Archers have received small damage boost on arrows for every class tier. And quite a decent damage boost at the Sniper tier.
Horses now have lower speed and maneuver across the board. Heavy horses has gained some armor and hitpoints. All lances have received damage boosts.
Commando tier shields have received a significant armor and hitpoint boost to withstand hardmode better.