http://cemu.info/index.html
So, they finally have something working. xD
Here's a short post about it as well: https://gbatemp.net/threads/release-cemu-wii-u-emulator.399524/ (though the thread itself spans over 160 pages since its release in October 2015).
There's obviously still a lot of work ahead, but it's awesome that things might be a lot quicker than with previous consoles since the Wii U is architecturally speaking more similar to PCs than previous consoles.
I've been keeping tabs on Cemu since it was first announced, it's made a lot of progress since the initial release. Obviously there is tons of work to do with it still, but here are some example videos of what can be done.
Mario Maker
https://youtu.be/SNRKmzPGdlk
Mario Kart 8
https://www.youtube.com/watch?v=Or4EmFaQUTs
And the not so much working, Xenoblade Chronicles
https://www.youtube.com/watch?v=tgV8VMrcjoI
The progress they've made so far is amazing considering how Original Xbox emulation and even things like PS3/360 emulation are so far out of reach. As Blizzard stated, the Wii U has a shares a similar architect with PCs.
lol at Xenoblade--that character create scene is the stuff of nightmares :xD:
I haven't read much of the topic. But how will the Gamepad functionality come into play? Not sure if going the DS emulator route would be ideal. Also, not sure since I don't own any gaming controller, motion controls too.