Currently, only U.S. will get the game in the West. However, Atlus has not come out with any statement that they'll never release Catherine in Europe and Australia. Atlus does not have an European branch, if you didn't know. But if we're lucky, another publisher
might release the game here in Europe and Australia, just like how 3D Dot Game Heroes was.
But if you have a PS3, go import Catherine. That's what I did.