Abridged run down:
-Has a mode that uses the touch screen, but an original style control mode is present.
-Features PS1 animated cutscenes
-No graphical or audio changes (ROBOROLL)
-Two new extra dungeons added
-A new secret boss said to be far more powerful than any before in the game.
-New English translation in the same vein as Final Fantasy VI Advance, where it was cleaned up to be closer to the Japanese version while keeping some of the fan favorite charms of the original English translation.
-And, as revealed, a new ending has been added to the game, along with a new mode to read character bios, see art and cutscenes, listen to music, and other fun things for the Chrono Trigger fans.