Honestly I do not see how Konami would have anything to gain by announcing it was coming to 360 until a while after it came out for the PS3. Hell they might even have to worry about those nuts who say they will not buy the game now because it was multiplatform.

I would not be surprised if the game eventually came to the 360, but I also doubt these rumors have very much basis in fact at this time. They just seem like really good guesses (a guess I would even be willing to make).