This summer, in August 2012, Nintendo will be releasing New Super Mario Bros. 2 for the 3DS portable platform. It'll be the second Mario platformer released for the device, following November 2011's Super Mario 3D Land. They're very different animals though; 3D Land felt like a cross between Super Mario 64 and Super Mario Bros. 3; New Super Mario Bros. 2, on the other hand, is a purely side-scrolling adventure and follow-up to the 2D Nintendo DS game released in 2006.
In the same press release, Nintendo also confirms a number of other 3DS news items. A system update on April 25 will allow users to create folders on the system's Home menu. The update will also allow for game patches to be released, paving the way for a mid-May fix to a particular Mario Kart 7 glitch.