there is a new Zelda game for the DS, Spirit Tracks. Take Phantom Hourglass' design and engine, then imagine the concept of Wind Waker with a train and fields instead of a talking boat and ocean and well, there you have it.
still looks fun though. I think this is more of a Majora's Mask entry into the DS series than a legit title, being they imagined something fun and alternative using a system that was previously developed. chances are they have working on a big redesign for a new Wii or new DS zelda title and this is buying them time.