The Official Kingdom Hearts page revealed that the game will release in December of this year.
The new trailer dropped today as an embargo on details about the game released just before E3.The trailer features Aqua (an original Keyblade master) in a battle against the Heartless which is remarkable to see in HD glory. The battled is a focus for Final Chapter Prologue, and the upcoming remasted includes new content titled Kingdom Hearts 0.2 Birth by Sleep – A fragmentary passage, which is included in the upcoming collection.
The entire new episode is done in “next gen” graphics. The story of the episode is a direct prologue for the upcoming Kingdom Hearts 3. The sad news is this release date pretty much ensures that we won’t be seeing KH3 this year.
As for content in the collection it will include:
Kingdom Hearts χ [chi] Back Cover, a new tale that sheds light on the mysterious foretellers, as well as new HD gameplay from Kingdom Hearts Dream Drop Distance.