A new trailer has been leaked showing off a video for something called Forza Horizon. The trailer credits both Forza developer Turn 10 and a new studio called Playground Games. The trailer depicts people partying at a concert and various hot rods blasting down a desert highway.
Playground Games has its own LinkedIn page which describes it as "an independent video game developer founded in 2009 by games industry veterans." The company is "based in Royal Leamington Spa, Warwickshire, in the United Kingdom" and is "currently developing our first title in partnership with a major publisher."
Could this been the project the developer is working on? Microsoft has promised some surprises for the Xbox 360, and the trailer lists the game as being a Fall release.