Forza Horizon does not ship until October 23, but developer Turn 10 is already gearing gamers up for its first expansion. The company today shared more details on the game's previously announced first expansion, now known as Forza Horizon Rally.

　　The add-on will cost $20 as a standalone purchase at launch on December 18, and is included with Forza Horizon's $50 DLC season pass. It pledges to deliver an "immersive and authentic" rally racing experience on Colorado roads.

　　According to the content's announcement, the Forza Horizon Rally expansion brings "deeper ruts," "higher jumps" and new surface types. Additionally, it packs in new "rally-tuned" cars that feature co-driver calls and more.

　　Forza Horizon is in development at Turn 10 in collaboration with United Kingdom-based startup Playground Games. The new company has not yet shipped a game, but it has a formidable racing pedigree.

　　Founded by former Codemasters (F1 series) alums, Playground Games is staffed also by veterans from now-defunct studios Black Rock and Bizarre Creations. Those two studios created Split/Second and Blur, respectively, before being shut down.

　　For more on Forza Horizon, check out GameSpot's review.