This video originally leaked on April 1 but like Kotaku suggests, there would be no real pay-off for all the work required to put this video together and given that Microsoft has already pulled down the YouTube video as well as sending Kotaku a PR type disclaimer chances are pretty good that this is the real thing; or at least close to it.
Here’s the statement:
The video in question was not intended for public distribution and may not accurately reflect features and functionality that ship in Forza Motorsport 4. We will have more to share on Forza Motorsport 4 in the near future.
Now here’s the video for you to enjoy in all its racing glory – or at least as long as the video remains up.