The Metroid Prime trilogy is about to be completed on the Wii over in Japan with the February 19 release of the New Play Control version of Metroid Prime followed by a later release for Metroid Prime 2. But more Metroid Prime content could be on the way!
Nintendo opened up a Japanese portal site for the franchise today, offering looks at the two Wiimakes and Metroid Prime Corruption. The point of note is at the bottom of the page, with a couple of lines of text reading "Another Side Story -coming soon-" and "The Metroid Prime history followed from the perspective of a space pirate."
Is this a new game in the series? That would seem a bit doubtful. It's more likely that this will be some sort of web-based content detailing a side story.
Whatever this mystery item turns out to be, we hope Nintendo is quick about an English translation!
Also notable off the portal site is a link to an official Japanese website for the Wii-make of Metroid Prime. The page offers images showing off the new control scheme (we uploaded some videos yesterday that do just that!). More importantly, the page confirms that the game will not support the GameCube controller, meaning you'd better get used to the new Corruption-style control scheme.