NCL recently unveiled their minisite for Wario Land Shake (Wario Land: Shake It! in the USA).  Along with the cheery character art for the "Sha King", Captain Syrup, and Wario, you'll also find what appears to be the game's animated intro and some gameplay footage.

Gameplay Footage: http://www.nintendo.co.jp/wii/rwlj/point/index.html
Click through the down arrows to the final page.

Animated Intro: http://www.nintendo.co.jp/wii/rwlj/prologue/index.html
Click on the text box in the top right corner.

Source: NCL Wario Land Shake minisite