Reference: Star Wars Saga Edition Core Rulebook (86).
Effect: Damage dealt by your unarmed attacks increases by one die step. In addition, you gain a +1 dodge bonus to your Reflex Defense (which stacks with the dodge bonuses granted by the Martial Arts I and Martial Arts II feats).
Normal: The amount of damage you deal with a successful unarmed attack is based on your size: Small, 1d3; Medium, 1d4; Large, 1d6.
Special: A situation that makes you lose your Dexterity bonus to Reflex Defense (if any) also makes you lose any dodge bonuses. Also, dodge bonuses stack with each other, unlike most other types of bonuses.