Atlus has announced that they currently have five titles in development for the Nintendo DS.
Sequels to Snowboard Kids (Sports), Shin Megami Tensei (RPG), Choro Q (Racing), and Jinsei DS (board game) are all on their way to Nintendos third pillar as well as an original title called Caduceus (Action).
No other details are known at this time on any of these games. Whether these titles are original or ports is still unknown.
Source: Atlus