During his keynote speech at GDC today, Nintendo President Satoru Iwata announced the next iteration of the popular Legend of Zelda series, tentatively subtitled Spirit Tracks.The DS title will feature a similar graphical style to Wind Waker and Phantom Hourglass, though it has yet to be confirmed if it will take place in the same world. The game's selling point is apparently the ability to control a train, though it is still unclear how much interaction players will have with the train, and how much it has to do with the game's story.
The game is currently slated for release this year in North America (and presumably Japan), though no solid dates have been established at this time.
Personally, I thought Phantom Hourglass was incredibly mediocre, and I think trains are a symbol of boring-ness, so I can't say that I'm exactly jumping for joy over this announcement. But, hey, more Zelda is more Zelda, I guess.
UPDATE: Here is a nice live feed trailer showing the title in motion. Looks pretty much like Phantom Hourglass with a train instead of a boat.
....And that conductor's suit looks 100 levels of ridiculous.