Update: A Nintendo of America spokesperson clarified Miyamoto's comments saying the new game is based off of last year's tech demo. Below is the company's statement sent to Game Informer:

In a recent interview, Mr. Miyamoto confirmed that a new Super Mario Bros. game for the Wii U system will be shown at this year's E3 Expo. This is based on the Mario experience that was demonstrated at last year's E3 Expo. We'll have more to announce about our plans for the E3 Expo at a later date.

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Nintendo today confirmed it will show off a new Super Mario Bros. title for the Wii U at E3 this June.

The news originally surfaced from an interview with Spanish newspaper El Mundo, where designer Shigeru Miyamoto allegedly said there will be a new Super Mario title at E3. Nintendo later confirmed the news in a statement sent to Eurogamer.

"In a recent interview, Mr. Miyamoto confirmed that a new Super Mario Bros. game for the Wii U system will be shown at this year's E3 Expo," a Nintendo spokesperson said. "We'll have more to announce about our plans for the E3 Expo at a later date."

E3 kicks off on June 5, 2012 in Los Angeles.

[Source: Eurogamer]