I apologize for that, I should have had the console by now. In sum, Amazon kept declining my payment for unspecified reasons and they ended up locking my account. After a lot of time speaking with support they finally lifted the lock, but the original order had to be canceled, of course.
I then created a new account, changed my payment method and they were still declining it! >_<
After finally sorting everything out, Amazon agreed to attempt to process the payment once more and it finally worked. The reasons for the initial failures are still a mystery, since neither Amazon or my bank claimed to be in fault.
Long story short, the Wii U is finally on it's way (this time for sure, I can see it on the Amazon tracking feature) and should be here on the 11th or 12th.
Again, sorry for the delay.