Just posted on Gametrailers. Wow, it's completely different than I had thought. Looks like there will be a new character similar to Linebeck from the first game, named Conductor R. Link also has some cool new items, and it showcases this cool roll attack he does. 

OOOOOOOOOOOOOOOOOHHH SNAAAAAAAAAAAAAAAAAAAAAAAAAP!!  That looks awesome.

Man he could roll before but this roll attack, well thats something else!

This game looks so awesome. Much more different to phantom hourglass than i expected. Conductor R is no Linebeck though. I'm gonna roll into that bastard, repeatedly.

I can't beleive the whole deal with the tracks. You get to build them as you go along, it's your own decision!

So its Legend of Zelda: Spirit Tracks Singing Party?

O wow that looks so much better then that teaser they showed at GDC

Saw it last year.  Nothing new.

i'm sold