It was a fact for awhile, then the big man himself(BIll Gates) came out with a statement saying they want to make Halo as best as it can. Kind of inferring that if PS3 comes out before Halo 3 is ready, they wont rush halo 3 to meet the launch date of the PS3... but I am pretty sure if Halo 3 is ready when the PS3 is, there will be a little battle going on. Halo 3 is already the most anticipated game of all time, so we will see