Could also be a way to test their online capabilities...
Pokemon is one of nintendo's number 1 franchises... as such loads of people will play... maybe they are holding people off from online just to see what kind of response they can get from said franchise.
How many pokemon players are there?
Are they actually prepared to accommodate such mass?
Are there enough Wii in the world for the pokemon fans?
Wut is the plural of Wii?
Lets face it, any number of reasons why nintendo would do anything... i mean... they changed the Revolution to the Wii!
Either way... i'm gonna go play with my wii now... maybe my friends will play with it later, an i'm gonna give up on why nintendo does what nintendo does