It is also worth noting that when a public IOSU exploit is released, users will be able to access the tickets for their games and extract and share encrypted NUS keys with others which can then be used for decrypting full game titles using CDecrypt and NUSGrabber. This will turn into a nightmare for Nintendo I am afraid.
Edit: Honestly the fact that you can even download full titles straight from Nintendo's servers and decrypt them with just the Wii U common key and an edited title.tik with injected title key and title id is just embarassing.