It looks as if Gamestop Stores and Multiplayer.com are displaying place-holder box art for the pre-order of "Donkey Kong Country 3D
". No such game has been announced by Nintendo, Retro, or anyone else for that matter, it's just kind of out there now. Anyone with a fairly decent knowledge of Donkey Kong games would notice that the fake box-art is actually the DS Jungle Climber
art, with a new title imposed over it.
Not only are they 'holding' a May 25th release date, there also appears to be a Smash Brothers 3DS
box in the Gamestop picture as well, with a release-year of 2012. The work on Kid Icarus
JUST finished, giving the studio very very little time to prepare the Smash title for this year. So remember it's all rumors still.(source 1, 2)