Namco, during the meeting for the announcement of past fiscal year's results, revealed that is developing several new projects, but it let slip only very few details of them. Here's a short list of what is known to be in development at this stage:

A character based action adventure game.
A fighting action game.
A racing game.
A "Major RPG" for the Gamecube.
A worldwide scale MMORPG.
A sports game.

Namco is also working on new Tekken and Ace Combat titles, as long as the racer Racing Evolution.