The next Mario game is in development at Nintendo EAD Tokyo, the studio has confirmed.
3D World co-director and EAD Tokyo team leader Kenta Motokura, who also served as designer on 3D Land, said that, if the new game is for Wii U, it "might need to make even more use of the GamePad".
Koizumi added: "There's still a lot more room for discovery and invention, and we'll continue to propose new and exciting game mechanics going into the future."
The pair also explained how some of 3D World's best power-ups came to be. "The Double Cherry came about during development on Super Mario 3D World when one of the level designers mistakenly placed two of the same characters into one of the courses," Motokura revealed.
"We ended up with a single player being able to control two versions of Mario at the same time. We all tried it and it was really amusing, so we scrambled to readjust the game so that this feature would make it into the final product."
Nintendo said in January that 3D World was its best selling first-party Wii U game in the nine months ended December 31, 2013. Having released in November, the title shifted 1.94 million copies by the end of the year, slightly more than 2D Wii U launch title New Super Mario Bros. U, which moved 1.74 million copies during the three quarters.