NeoGAF user mj1108 came across this find earlier. In March, when discussion of Nintendo's "Project Cafè" became too loud for Nintendo to ignore, a few intrepid internet detectives discovered a header and URL basically confirming the name on Nintendo's "Wario World" developer support website. Nintendo quickly hid everything behind fake 404 errors if not logged in with the proper credentials, which basically shut everyone out.
Using google, mj1108 discovered how Nintendo is hiding the project now.
Gotta say, if you're going to try and hide a name, this is by far the best way to do it.