It won't do that well in Japan (the usual decent opening week w/ hardware boost, followed by a huge drop in the following weeks)
However in NA, it should sell quite well in theory as NA made up a good portion of SO3 sales and the 360 has double the install base there. However again, you could question the percentage of 360 owners that like JRPG's. (LO could help one argue otherwise)
But yeah, logic says it should have been multiplatform.







