Mario vs. Donkey Kong is a prototype tech demo made specifically for showcase at GDC, so chances are this is not a game that we'll see in the future.
However, there's been no confirmation that it's NOT in the works as a full title. Check out the video below to see the very cool demo.
Super Smash Bros. Leaker Discovered
Leaker was an employee of Nintendo of America
Mario Kart 8 DLC adds Link, Animal Crossing and More
Some awesome roster additions
Pokken Tournament Just Confirmed by Game Freak
Only confirmed for arcades in Japan so far
Leak Reveals Rest of the Super Smash Bros. Roster
No confirmation from Nintendo
Music Player Unveiled for Super Smash Bros. 3DS
Music to my ears
Phoenix Wright Trilogy Gets A Makeover
I have no OBJECTION to this
GameStop President Still Believes in Nintendo
Nintendo magic and the amiibo ace
Wii U Game Preorders Increase
Wii U benefits from Gamescom
3DS Homebrew Channel on the way
Reportedly in final stages of development
Pokemon Trading Card Game Coming to iPad!?
Nintendo to test smartphone/tablet market
And thus marks the first time I've ever been excited for DLC. ... Mario Kart 8 DLC adds Link, Animal Crossing and More
Wii's World is not officially affiliated with Nintendo! (but they wish we were).