According to an article on Gamasutra, Metroid Prime 3 has overtaken Bioshock to become leader of the cross-platform chart. The figures are tallied by taking totals from Amazon's US, UK and Japanese sites.
Currently, the Wii Top 5 looks like this:
3,035 news items
NBA Playgrounds new content teaser
Switch must wait again
A day with Pokemon GO Down Under
Splatoon's Last Ever Splatfest is Coming
And It's Sister vs. Sister
Nintendo President Satoru Iwata Passes Away at 55
Rest In Peace
Nintendo has detailed the return of its World Championship
Do you have what it takes?
Disney Infinity 3.0 Edition Officially Revealed
The Force is strong with this one...
Rumor: Disney Infinity 3.0 Leaked Early
Straight from a Galaxy Far, Far Away...
Mario Kart 8 DLC Pack 2...OH YEAAAAH!
Nintendo should do this more.
Wii's World is not officially affiliated with Nintendo! (but they wish we were).