Nintendo has two major internal divisions within its Kyoto headquarters:
Entertainment Analysis and Development (EAD), 5 divisions:
EAD 1 - Hideki Konno (Nintendogs, Mario Kart DS)
EAD 2 - Katsuya Eguchi (Animal Crossing Wild World, Wii Sports, Wii Play)
EAD 3 - Eiji Aonuma (Zelda: Twilight Princess, Zelda: Phantom Hourglass)
EAD 4 - Hiroyuki Kimura (Yoshi Touch & Go, New Super Mario Bros., Big Brain Academy)
EAD 5 - Takao Shimizu (Donkey Kong Jungle Beat, Super Mario Galaxy)
Software Planning and Development (SPD), 4 divisions:
SPD 1 - Yoshio Sakamoto (Metroid Fusion, Rhythm Tengoku, WarioWare Smooth Moves)
SPD 2 - Hitoshi Yamagami (Dr. Mario, Super Princess Peach, Tetris DS)
SPD 3 - Kensuke Tanabe (co-developments with other internal teams and 3rd parties, e.g. Metroid Prime, Battalion Wars)
SPD 4 - Shinya Takakashi (Brain Training, English Training, Kanji Training, Band Bros.)
However, there is some inter-changeability with these teams, with staff forming new teams for specific projects.
Adult Face Training is co-developed by Intelligent Systems, and comes with a camera, it's not out yet, due for release next week, Aug 2nd:
http://www.nintendo.co.jp/ds/ykoj/index.html