On Nintendo’s website, it once said New Super Mario Bros. U will run at 1080p. Shortly after, Nintendo replaced 1080p with ‘high definition.’ Now, via the updated official site for the upcoming Wii U launch game, Nintendo confirms that the 1080p part was inaccurate.
The previously stated information about video output for this game was inaccurate. The Wii U console supports video output of up to 1080p.
While all Wii U software titles display high definition graphics, resolution for specific titles may vary.