This is what it says on this website Preorder Wii - The Latest Info on Preordering Wii's
here is the part that scares me
You need to preorder your Nintendo Wii Console and Games now. Or else
don't expect to get one before christmas, or even until this spring. Even if
you don't receive your Wii on launch date, you should still preorder your Wii
as merchants could be backed up until a couple of months after release.