This is a list of the ones that have been added:
The nightlies, you can get the list here - https://github.com/xhp-creations/libretro-super/blob/master/recipes/nintendo/wiiu
Besides those , I have made Fuse, O2EM, Pro System, and Stella.
Whatever is left over from those on this page - http://wiiubru.com/appstore/#/category/emulators is what needs to be built to update the appstore.
Of course, CHIP-8, gacubeboy, and GBiine are not libretro cores.
Here you go I think that's all of them.
http://www107.zippyshare.com/v/CBY5feWP/file.html