This is footage from a Blur 2 prototype build found on a 360 dev kit last year. The build is dated November 9, 2010, around 3 months before Activision closed down Bizarre Creations.
Here's some footage of later builds that were leaked years ago, just for reference of how much the visuals changed from this stage:
Here's some footage of later builds that were leaked years ago, just for reference of how much the visuals changed from this stage: