Kingdom Hearts 1.5 HD Remix is somewhere around 80 to 90 percent complete, series co-director Tai Yasue Told Famitsu this during one of their weekly features.
He also stated that the development team is investigating the adding of special elements to the clear time(Similar to NG+).
Yasue also confirmed that Kingdom Hearts 1.5 will not have a secret movie.
Kingdom Hearts 1.5 HD still has no solid release date for Japan or anywhere else.
Source- Game Nyarth.