The 'April Alpinestars Car Pack' features cars as diverse as the 2012 Jaguar XKR-S, Jaguar's first full production car to reach the elite 300 kmh (186 mph) club, and Elvis's famous 1959 Cadillac Eldorado Biarritz Convertible.
Costing 560 Microsoft Points (£4.80 / $7) to download, the 'April Alpinestars Car Pack' will be available from Tuesday, April 3.
Forza Motorsport 4's DLC is free to download for season pass holders. Costing 2,400 Microsoft Points (£20.50 / $30), the season pass represents a 30% saving when compared to buying each pack individually.
Turn 10 recently announced Forza Horizon for release on Xbox 360 later this year.
> Read our review of Forza Motorsport 4
The full list of cars in the 'April Alpinestars Car Pack':
Watch the Forza Horizon announcement trailer below: