Yes indeedy, the next in the Forza Motorsport series is Forza Horizon. It's being made not by Turn10 but is being farmed out to Playground Studios. It's got a packshot! And a screen shot!The shots - for a game due out this Autumn - are basically all we have after this description that is: "Forza Horizon is being developed by Playground Games in collaboration with Turn 10 Studios. Playground Games is an independent UK game development studio formed in 2009. It was founded by the leadership team responsible for award-winning racing franchises like TOCA, Colin McRae Rally, GRID, and DiRT. Over the past two years the studio has enhanced its core team with experienced developers from Bizarre Creations, Black Rock Studios, Slightly Mad Studios, Criterion Games, Rockstar North, and Ubisoft Reflections, among others. Today, Playground employs more than 100 staff at its headquarters in Royal Leamington Spa, working exclusively on Forza Horizon."
Source:
Turn 10