I know that this really seems like a no-brainer for Nintendo, but we still have to keep it marked rumor. We're hearing that Nintendo is already hard at work on a 3D Mario title for the Wii U. New Super Mario Bros. U will keep 2D fans happy for 2012, with this 3D Wii U Mario game tentatively penciled in for a 2013 launch. I guess we won't be hearing about this rumored game until E3. Let the wait begin!