It seems as though Lost Reavers had a rather stealthy release on the Japanese Wii U eShop today. Up until now, there was no word on when the free-to-play title would launch, though a beta test was conducted in Japan back in September.
You may better recognize the online co-op game by its tentative title, Project Treasure, which is what it was called during its announcement in the January Nintendo Direct. More details were released by developer Bandai Namco throughout the year, including a final title, and a few trailers, one of which you can watch below. Though we know Lost Reavers will make its way to the West, there is no word on when.