To promote the upcoming (Fast &) Furious 7 movie, Microsoft/Turn 10 Studios will be releasing a standalone addon for Forza Horizon 2.
Forza Horizon 2 Presents Fast & Furious will be a standalone release that will not require a copy of Forza Horizon 2 to play. Launching March 27th, this release will be available free of charge for both Xbox One and Xbox 360 owners until April 10th as a promotion for the April 3rd release of Furious 7. After April 10th, the Fast & Furious expansion will be priced at $10 on the Xbox Marketplace.
Below is a small teaser for Forza Horizon 2 Presents Fast & Furious, courtesy of Eurogamer.