In an interview with the Japanese Kotaku, Lost Planet 2 producer Jun Takeuchi has said that the developers have had to cut out a large part of the game's content because of the limitations of the DVD-format. This will not only affect the Xbox 360-version, but the Bluray version for the Playstation 3 as well.
Not all is doom and gloom, as Takeuchi points out that the cut material might show up as DLC at some point. Let the conspiracy theorizing begin!
At least they managed to fit Marcus Fenix in there.