Well if it wasn't a new Forza game that was just revealed via a leaked teaser video from the Microsoft Xbox 360 Spring Showcase event.

Today a new video hit the intertubes revealing a new Forza game entitled 'Horizon' with a 'Fall 2012' release at the end of the clip.

While the video does not show any actual gameplay whatsoever, it does tease several elements which would be new to the franchise. The trailer shows racing along open roads a la Need For Speed as well as Rally Racing and excessive partying which reminds of Test Drive Unlimited.

Check out the video below. More details should come in by the beginning of next week.