For now nothing, unless we get new info on Wii relax or whatever it's called.
The way i see it is that Zelda Wii will do 5 mil+, but no Zelda game has sold over 8 million so i cant see it doing above that. Also i see SMG2 doing very modest numbers, above 5 million but i don't think it'll compete with SMG numbers imo. However they seem to be announcing 10mil+ sellers each year(last year NSMB, the year before WSR), so we'll just wait and see