During the Nintendo Conference, Namco Bandai announced to press that it's working on a new Ace Combat title for 3DS, tentatively named Ace Combat 3D. 4Gamer's brief description of the game mentions battling over detailed ravines and town areas in 3D.
The other new game announced by Namco is Double Pen Sports, which appears to (somehow) require the use two styli on the bottom screen to control archery, soccer and more. Of course, the actions also appear to be divided into two steps, suggesting they could be done consecutively (with one stylus). Namco Bandai's Taiko Drum Master series on the regular DS uses two styli, so this wouldn't be the first time the publisher used the "double pen" gimmick.