Angry Birds Star Wars II features a lot of unused content and they are:
Unused CharactersJedi Younglings.
In the files, there is a sprite for Yoffar which would replace the Spies or Rodians in the Pork Side Levels of Rebels.
The initial episode select was simplier, with just some stars and different button placement.
Beta DesignsAngry Birds Star Wars II, the Battle Droids are different, with green armour parts instead of skin.
In the gameplay trailer, Anakin Skywalker Episode I's Podracer has a simplier and longer design.