Dubbed Mega Man Legends 3: Prototype Version, it will contain an early look at the game and an unlockable debug menu.
Mega Man Legends 3: Prototype Version will be an eShop launch title, according to the Capcom Unity blog.
The game, a demo of the forthcoming Mega Man Legends 3, will star Barrett, a new character who leads a sky biker gang. It will feature a sample of the game's missions, and once you finish it, you'll be able to explore unfinished areas of the full game and use a debug menu to check out other moves and abilities.
Prototype Version is the next stage in Capcom's fan-focused development process for Mega Man Legends 3. Developers directly interact with members of the community to get ideas from fans, as well as show off the inner workings of game development.
No price was offered for western markets, but Mega Man 3: Prototype Version will launch on the Japanese eShop for ¥300 ($2.45).