I played Phantom Hourglass, and I really liked it, so I suppose I'll like Spirit Tracks too. I guess the train riding also plays a part in the plot, as the title suggests. Otherwise, I too don't understand why feel it necessary to keep Link riding stuff instead of the old-school walking.
I really do hope that they include more new stuff and features in this title. The trailer shows just a little bit of new stuff, which I don't think will give anything really refreshing.
I also hope to have more of the classic theme in this title. It was really missing in Phantom Hourglass. I mean, there was only a vague version of it in the overworld(the sea) and a nice version in the multiplayer, which I don't exactly consider to be in the game, since the Legend of Zelda is at heart about Link's adventures and not about any multiplayer component. The fact that the trailer includes a vague version of the theme really concerns me.
Anyhow, I'm definitely buying this game. I was worried the next Zelda will be for the Wii, since I don't own a Wii. Phew.
To be released this year FTW