In Nintendo's latest release list, the oft-delayed Gamecube-turned Wii game Hoshi no Kirby (basically, Kirby Super Star) is still in development. The title was shown at E3 2005 and literally no new details have been shown since.
The video below shows you what kind of game it may be. This trailer is old, so many things may have changed. Either way, it makes my heart hurt to watch this, seeing how it looks like Kirby 64, which, in my opinion, is the best game of all time. I want my Kirby!