Square Enix has released a new trailer for Kingdom Hearts HD 2.5 ReMIX, detailing all of the additions fans can expect when the game releases on December 5th for PS3. The major additions are the Final Mix versions of both Kingdom Hearts II and Birth By Sleep, which are releasing in Europe for the first time. This means there will be new bosses to face, new items to unlock, and new cutscenes to watch for the first time.
The additional content also has the soundtrack remastered with an orchestra reworking 90 of the game’s tracks. There will also be new gummi ship missions, new action and support abilities. additional deck commands.
Source: PS Blog