It would also give everyone (in Japan) a HUGE incentive to buy a WiiU @ launch and double dip on the game.
If Nintendo and SE are smart, they wouldn't mention the WiiU version again until after the Wii version is out. Market the Wii version heavily, achieve that 4 million is sales, then during a commercial right after the Wii U launch, show nothing but gameplay that looks like the CG in the trailer and at the end of the commercial say, "Now available for Wii U".