According to IGN's Matt Casamassina Super Paper Mario will be making its debut on the Wii console. In a recent mailbag Q + A. Matt was asked whether there was any chance Nintendo is going to move Super Paper Mario onto Wii? Or was that just a one-time deal with Zelda?
As of yet, there's no official confirmation from Nintendo.
Source: http://wii.ign.com/mail/
Matt responds: Hmm. How should I write this? Have to be vague, you know? Let me just say that yes, Paper Mario will be headed to Wii and not GameCube. Now read between the lines, damn you! Wait. That was a terrible hint! All right, that's it for today. Time to beat Bozon.
As of yet, there's no official confirmation from Nintendo.
Source: http://wii.ign.com/mail/