The new 3D Platforming entry to the Mario series is being worked on by Nintendo EAD, the division that worked on the Super Mario Galaxy games for theNintendo Wii and Super Mario 3D Land for the Nintendo 3DS. The game has been confirmed for E3 2013, it will be playable at that event!
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The newest entry in the Mario Kart series is also being worked on, the will also be present at E3 2013, and, like the new 3D Mario game, it will also be playable at the event!
Super Smash Bros. 4, although making good progress, has been a huge undertaking. Mr. Iwata has asked fans to "...wait just a little longer." He has revealed that the first screenshots of Super Smash Bros. 4 will be unveiled at E3 2013!
For those who really look forward to any information regarding these titles, myself included, E3 2013 will be taking place at Los Angeles, California, June 11th-13th, so mark your calendars for those days!