LucasArts has answered the following question about Rogue Squadron III: Rebel Strike:

What are some new levels for Star Wars Rogue Squadron III: Rebel Strike? And do you get to decide who you are during the missions?

In Rebel Strike you can choose to follow the adventures of a variety of classic heroes from the Star Wars trilogy including Luke Skywalker, Han Solo, Chewbacca and more, and traverse exciting missions encompassing flight action, and ground-based character or vehicular combat. You will have the opportunity to fight in such legendary vehicles as the X-wing or Millennium Falcon, Imperial speeder bikes and AT-ST's to name but a few! Be sure to visit the Star Wars Rogue Squadron III: Rebel Strike official site for more information about this new game.