I believe that, like NSMBU, 3D World on Wii U will fail to live up to series sales standards, because:

-The "core" will see it as lazy and rehashed due to its modest audiovisual presentation and conserrvative style compared to the Galaxy games.

- The "casuals" won't see the a significant difference between it and NSMBU and 3D Land.

- Both will be put off by Mario fatigue, with this being the 4th Mario platformer in 2 years.

Nintendo is killing its biggest mascot with these safe, unadventurous, and lately over-abundant entries.

I predict 3D World will land beteen 4m and 5m lifetime sales. For comparison, the current lowest, Mario Sunshine, sold 6.3m, Mario Galaxy is appaoracing 11m, Galaxy 2 is at 7m, and Mario 64 sold 11.9m.

i dont think it will sell less than 6.3 at the end of wii u's timeline

it's nintendo, it will sell no matter if it's the same thing over an over, what reggie said. If it's a great game you enjoy, you buy it, and every installment of mario delivers