For those of you who are not aware of Wario World, this is a website for Nintendo publishers to go and receive their development kits. The interesting thing comes when you add the tag cafe at the end of the url.

https://www.warioworld.com/cafe/

If you try adding any other ending tag to the url (Like Wii) you will receive a 404 error. Could this be a confirmation that Cafe is the code name for the Wii successor?

Update: Nintendo has confirmed project cafe. HERE