But they insist it was just a tech demo, not a future project.
Nintendo had their panel up at GDC 2014, and were showing off a rather interesting tech demo developed by Nintendo Software Technology for Mario vs Donkey Kong for the Wii U, which was developed using Nintendo Web Framework. Siliconera had the chance to try it out and gave some impressions on it.
The controls for the software were solely on the GamePad, and the player could “build bridges by drawing a line at the red squares or get rid of bridge a by tapping on them.”
Nintendo’s Damon Baker was asked whether the prototype might go on to become a full game before long, but Baker said that the prototype was just what it was and Nintendo had no plans to release it to the masses.