"Welcome to the Warp Zone! ... Congratulations, you've discovered the Virtual Console's hidden area. This is your secret doorway into another dimension; a portal into the past, if you will."
Nintendo plan to use the warp zone to put up bits of trivia about some of it's main franchise characters. So far there's been info about Kirby and today if you look it's info about secrets in Ocarina of Time!
A nice little surprise if indeed a little bit superfluious!