Via Gamespot.com:

Disney and Lucasfilm on Thursday announced the latest update for mobile game Star Wars: Commander, introducing a new storyline and gameplay elements. The game launched in August and has already climbed the charts, with around 15 million downloads to date.

Called “Secret Alliances,” the time-limited campaign–available right now–sees players fighting to secure the fate of the planet Er’Kit. The update also packs in new gameplay elements such as Starships, traps, and contraband.

Below is a roundup of the rewards you’ll receive for completing the Secret Alliances campaign, courtesy of Disney. You can download Star Wars Commander today for free from iTunes or Google Play.

Universal

Johhar Kessen Hero Unit: Former senator Kessen’s custom sniper blaster, “Karina,” deals extreme damage to soft targets. While he can out-range many static defenses, his ability to damage them is low.
Rebel

A-Wing Starship Strike: The Rebel Alliance uses A-Wing starfighters to support ground forces. Their powerful weaponry employs an advanced targeting system, concentrating firepower to dispatch particle shields. (Requires Starship Command)
HWK-290 Starship Strike: Originally manufactured without weapons, this HWK-290 freighter was outfitted to drop incendiary bombs. The bomb blast affects a moderate area, making it most effective against infantry, but also very capable for attacking enemy HQs.
Empire

TIE Advanced Starship Strike: A newly developed advanced prototype of the TIE Starfighter line, these starships are equipped with a highly sophisticated target tracking system, making them extremely useful against shields. (Requires Starship Command)
VT-49 Decimator Starship Strike: Receiving command of a VT-49 Decimator is considered an honor in the Imperial Navy. Used as a raiding vessel, this ship drops firebombs which burn a moderate area. It is most effective against infantry, but also very capable for attacking enemy HQs.
New Features:

Contraband: A new currency called “Contraband” will be introduced with this build. Players will be able to unlock a new, powerful unit that can only be leveled up using this currency.
Traps: Players will be able to place three new traps around their base as a defense mechanic. Traps will have to be ‘reloaded’ using currency once they have been used to defend a base in battle.

Click below to see the trailer.