EmuNAND is out for Wii U with IOSU:
http://www.wiiubru.com/forum/forum/download/file.php?id=26
https://www.youtube.com/watch?time_continue=23&v=Sx5TUdQiAfI
http://www.wiiubru.com/forum/forum/download/file.php?id=26
https://www.youtube.com/watch?time_continue=23&v=Sx5TUdQiAfI