Unlocks the Battle Droid for use in Geonosis Academy
Unlocks the Wookiee for use in Multiplayer
Unlock Team Photos (found under sketchbook bonus)
At the main screen (which has Campaign, Options and Multiplayer) you choose Options. Then at the options screen, using the D-Pad, you press Up, Up, Down, Down, Left, Right, Left Right, B, A, Start. The ewok music should start. Don't press the buttons too fast or too slow. Just keep it steady.