I'm sure that NSMBWii will outsell MW2 worldwide by the end of January. Well, not sure, but it's pretty likely.
But that doesn't mean Reggie wins. The bet was MW2 no the 360, Americas only, by the end of January. Sadly, that just doesn't seem to have any shot at happening.
There's no doubt NSMBWii will win out lifetime, though, in every region.