There's no gameplay in this trailer, it's just a teaser for Forza Horizon, the next entry in the Xbox 360-exclusive driving title. But it does say the game will arrive this Fall, which I suppose is to be expected. Word has it the formal announcement will be made on Monday.

If the trailer is taken down from YouTube, you can see it through this embed via Gaming Everything.

Forza Horizon trailer leaks, game out this falle [Gaming Everything. h/t Sgt.LulzJager]