The game is a port of the 1995 SNES original, enhanced to take advantage of the DS touch screen functionality and dual-screen setup. Square Enix is promising additional content and features, such as an extra dungeon and wireless play mode.
http://exophase.com/ds/chrono-trigger-ds-confirmed-for-us-release-6167.htm#more-6167
http://exophase.com/ds/chrono-trigger-ds-confirmed-for-us-release-6167.htm#more-6167