Nicalis has announced that the WiiWare version of Cave Story will be hitting the North America WiiWare store on March 22nd.

Some of the new features for this enhanced version include:

- New character designs and completely redrawn background and interface, exclusive to Wii
- Remastered music as well as the original soundtrack
- Mix-and-match new/old artwork and music!
- Five new play modes (including Sanctuary Time Attack and Boss Rush)
- Over 20 epic boss battles, 15 levels to explore and 10 unique weapons
- Three unique endings

No word on a release for the rest of the world, but hopefully it won't be long after that.

Official Cave Story site
Preview trailers from back in 2008