Well, it makes sense. NSMB is the second best-selling game in the series behind SMB1. Letting people know that this is an actual sequel to that game is a good idea!
Whatever Mario game they have planned for the WiiU launch is going to need to differentiate itself from this, if it's going to be 2D. That NSMBMii won't be a good idea next to this, so soon after it releases.
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"When I was a young man, I had liberty, but I did not see it. I had time, but I did not know it."