Lightsaber Duel will expand on that idea. Rather than merely going all Star Wars Kid with your iPhone, you'll actually be able to engage in duels with your fellow wannabe Jedi or Sith via a Bluetooth connection with their iPhone. You'll also be able to play music during the duel. However, we're not yet sure if that means only music bundled with the app, or if you'll be able to play your iTunes music. "Duel of the Fates" and "Battle of the Heroes" are fine lightsaber battle tunes, but the übernerd in me wants to be able to mix it up and throw in a little "One-Winged Angel" from Final Fantasy VII or "Burly Brawl" from Matrix: Reloaded.
THQ hasn't released pricing info yet, but assuming it isn't heinously expensive, this is an app that's likely to hit the top of the App Store charts within hours of its release.