User blog:Scorpion Tank 123/Japan Release date?

I want to know when the Japanese release date is because by the time the 3DS version comes out here in the U.S. I'm pretty sure the full roster will have been revealed and I want to find out for my self. So to avoid spoilers I'm going to be off the website when it comes out in Japan. But I don't know the launch date and can anyone tell me if they know?