Want as you might, Retro’s upcoming Wii U title is not Zelda. Designer Shigero Miyamoto has told as much to IGN.
“They’re too busy for that sort of thing right now,” he says, while leaving hope by noting that the developer making a Zelda title is not “out of the question” somewhere down the line. For now though, it’s a no-go.
As for what it is that Retro is busy doing at the moment, we’re fresh out of luck.