http://www.gamingnexus.com/FullNews/Dead-Island-roundtable-scares-up-some-details/Item23471.aspx
Expect the crafting aspect for weapons to be important in Dead Island. While some new weapons can be found, players will need to track down the right materials to make weapons that are powerful enough to drive fear into the zombie outbreak that has taken over the resort island. Players will start with a basic knife for survival, but don't expect to last too long with just that weapon.