Silver's right. The only thing that may have been cut due to it jumping to multiplatform status was the possibility of a Japanese audio track for the Western release as it would take up too much disk space. But that was more a fan initiative than something SE was seriously contemplating (I remember an interview with someone from SE - I don't remember who - who was actually very surprised to hear that fans wanted the Japanese audio track), so I doubt the 360 port actually had any bearing on it.

A lot of the stuff cut from the game was likely the result of time constraints. After all, how long has this game been in development? Way too long. They have to make money eventually and they can't do that until their product is released.