Square Enix will launch the previously teased, free “Champion Summon: Sora” downloadable content alongside the release of Kingdom Hearts HD 2.8: Final Chapter Prologue on January 12 in Japan, the company announced. It will be available for a limited time, through March 31.
A North American and European release is planned for winter, but if it follows the same pattern as Japan (releasing on the same day as Kingdom Hearts HD 2.8: Final Chapter Prologue), then it should launch on January 24.
Thanks, @_KingdomHearts and @WOFF_JP.