The one aspect of 3ed D&D that I never really understood was why weapons skill doesn't add to a character's Armor Class? In some ways, D&D tried to incorporate this through the "fighting defensively" and "total defense" options, but they never had acknowledged the amount of deflection that a weapon has in combat more so than armor. Parrying incoming attacks should somehow be included in the AC formula in regards to weapons skill for this upcoming addition. I've seen them try to do this before with the Duelist prestige class but it just seemed like the AC didn't add up to anything useful. I can understand that even a skilled swordsman couldn't parry and incoming arrow (without some kind of sick training), but still, a Level 18 Fighter using a longsword should get at least some natural bonuses to AC (without any extra feats) in melee fighting compared to a Level 1 Elf Wizard who is also using a longsword. Weapon skill shouldn't just be reflected only as a Base Attack Bonus, but also as an increasing effect on melee AC.