Two videos are up on the official site for Wario Land: The Shake Dimension. One is a prologue video, which you can find with english subs here:
http://www.youtube.com/watch?v=UfPxl9AA0HY
The other one is a gameplay-video, which can be found here:
http://www.nintendo.co.jp/wii/rwlj/point/index.html (Press the arrows on the screen until you reach the bottom one)
I think it looks really promising. This really looks like it's shaping up to be a great game.