Wii_Master, once New Super Mario Bros. Wii releases, it will bump what ever is number 5 at that time off the list. By then DJ Hero will have at least passed Star Wars Clone Wars and maybe Fifa, so it is more likely one of those games will be bumped from the list. But yes once, NSMB Wii releases it will definitely be in the list, and probably will at least take the #2 spot almost immediately.
Koffieboon, It will be interesting to see Rabbids sells, the last game did really well, but like you said this game is in a different genre so it is hard to predict how it will do.