A theory about Mario games and where they've been and where they're headed.

[whacker41]

Well, considering the wii's success, there should be another main mario game on the wii. This would be the first time that there would be 2 main mario games on 1 platform since the NES. Therefore, the next game could either be the SMB2 of 3-D platforming, or as you said, the Super mario world of 3-D platforming.