I don't think it's fair that the US might not get this game. It looks really fun.
Testing in the United States under the name JUKEBEAT has been happening for a while now, and has been out in Japan for almost 2 years. To make is simple, it's Dance Dance Revolution meets Whac-a-Mole.

...posting wasn't allowing images so use google...

Intro
gameplay video
Try it for yourself

(those who suffer from flashes and patterns may want to keep away from the videos)