Below is some information that has been spread about Zelda Cube. These are rumors, however, they may turn out to be true or they may not. We don't know at this point.
Multiple Discs - This is unconfirmed but likely, just how many discs is unknown
Other Playable Characters - This is what I heard, supposedly you may be able to play as other characters besides Link, like perhaps Zelda or Ganon. And I don't mean like Majora's Mask, where you change into Zoras and Gorons, but you're still Link. I mean playing as someone else, where you're no longer Link at all. Again, unconfirmed.
Internet Competition - Very likely you'll be able to play online with other gamers around the world.
Absolutely Huge Worlds - Supposedly Hyrule will be huge in this game, the size will be absolutely enormous. Many, many times larger than the Hyrule of Zelda: Ocarina of Time. Likely but unconfirmed.
The SpaceWorld Shots - As we all know, the original shots of Zelda Cube and the new cell-shaded shots are very different. Is it possible that they are two different games? We think that Nintendo has scrapped the Link and Ganon battle scene from 2000, but how can we really be sure? Just a thought.
More will be added soon.