A portion of a GamesRadar interview with Shigeru Miyamoto...

GamesRadar: Because Super Mario 3D World is your first HD game, did you ever consider recreating any classic 3D stages in the game. Or did it perhaps get you interested in HD remakes of older games like Super Mario Sunshine, or the Super Mario Galaxy games?

Mr. Miyamoto: As for remaking previous games in HD, that's certainly possible, but currently most of our devs are working on new stuff, and we like to have them working on new stuff. HD remakes might, however, be a good project for a development partner of ours, so that's something I hope we have the opportunity to introduce in the future.

But the main thing that's always going to be on our minds are, "What new elements of gameplay can we use with the GamePad as applied to some of these older games?" We want to find some way to bring a new experience to this than simply update the visuals and leave it at that.