http://www.gamingnexus.com/FullNews/Dead-Island-roundtable-scares-up-some-details/Item23471.aspx
Zombies will have several standard hit zones when struck during melee combat, including the head, arms, and legs. There will also be damage modifiers based on weapon type. Impact to limbs with a sharp weapon may result in the severing of that limb, while blunt weapons may break or shatter the limb.
