Blackberry has announced that they have no plans to launch the new BlackBerry 10 devices in Japan. According to BlackBerry, "Japan is not a major market for BlackBerry and we have no plans to launch BlackBerry 10 devices there at this time." Part of this could be to the fact they have just 0.3 percent of the market currently.
After all, why launch a device in a country when they appear to not be very keen on your previous devices. This appears to be the logic BlackBerry is operating off of as they say the cost of translating BlackBerry 10 to Japanese is just to high for them to consider it a good investment.
Current BlackBerry owners can rest easy knowing that BlackBerry will continue to offer to support to existing owners in Japan.