shame if true. I really wanted the cutscenes and bosses to be in the game final mix style
You are essentially getting both.
Ver. 1.07 is updating the main story of the base game with new abilities, keyblades and story content. We dont know the story content but the least we can assume is cutscenes. There may be additional story events or battles in the actual base game.
ReMind is post game for a reason if you know what happens at the end. There is a huge portion of context missing at the end of the game that involves time travel.