We finally have some definitive word on this project, but it might not be the news you want to hear. Nintendo's Damon Baker Mario Vs. Donkey Kong Wii U is not planned as an actual game release, but instead, just a tech demo for the Web Framework service.

Looks nice. I don't really like the gameplay of these that much though.

Upcoming Nintendo Direct then?

Might just be a tech demo for developers that wish to use Nintendos framework,

I really don´t know why nintendo fan pages are not suprised about the "no announcement"  

Was is announced before ? 

Nintendo Everything : "Mario vs. Donkey Kong Wii U – GDC Web Framework demo footage "

Go Nintendo : Mario vs. Donkey Kong Wii U - GDC Web Framework Demo

Looks interesting.

I should learn to read the description : 

"The demo is not confirmed to be a full game."

but why does Nintendo waste their time then ? -.- 

Possibly as a proof of concept of their Web Framework development thingie? The assets would be pretty easy to port over. 

I need to get into this series, in any event. Hopefully Nintendo will bring the GBA original to WiiU or 3DS.

Looks too awesome and polished not to be a game for consumers at some point. Reminds me of Toki Tori or Krusty's Fun House. I'll take it at the right price.