Since it's replacing WiiFit which still sells very strongly it's already guaranteed to be a million + seller (bunlded with bb).
Add in stand alone sales to existing BB owners like me and you've got probably at least another 2-3m. At $20 it's an almost no brainer sale to anyone who even occasionally still uses WiiFit.
I think 5m lifetime is the minimum this title can do and upwards of 10-15m.
But it won't move any hardware (at least none that Wii Fit wasn't already going to move)







