Nintendo Power went ahead and revealed that the game in question is a remake of La-Mulana, a freeware Metroidvania type game designed in the style of 8-bit MSX games. If you haven't played it, check it out! The new version will have more of a 16-bit look, which is probably a good idea for a market that didn't have the MSX. And yes, it does give us the tiniest bit of concern that Nicalis is working on something else before we have Cave Story. Only a bit.