Gamasutra had an interview with Q Entertainment's Tetsuya Mizuguchi:
GS: As a last question, what do you think of the Wii?
TM: It's very unique! Very special.
GS: Have you thought about it at all?
TM: yeah…but we haven't decided yet about future production on Wii.
GS: Are you nervous about making games for Wii? It's an untried market, and if you make a game for that, it's difficult to port to any other.
TM: Yeah, so I want to make games that many people want to play, and I want many people to play them. And maybe Wii is very specialized. So if I lose the chance to show my game to a number of people, I have to think about that. But I can't tell the future.