The Tokyo Game Show will take place 3/21 and 3/22.
Some of the seiyuu guest info that has been given in
magazines and such are:

Culture Publishing     Imai Yuka
Media Works            Nagasawa Miki
                       Nagashima Yuko
                       Hikami Kyoko
                       Tanaka Rie
                       Hanba Tomoe
Square                 Ohtani Ikue
                       Amano Yuri
                       Kasahara Hiroko
Hudson                 Yokoyama Chisa (3/21, 10:00)
                       Touma Yumi     (3/21, 15:00)
                       Takahashi Miki (3/22, 10:00)
Shougakukan            Sotsugyou III girls

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Hitoshi Doi, Toshi Nibunnoichi                                  doi@tcp.com
half a UFO catcher doll, half a cel          801 tactical training squadron
http://www.tcp.com/doi/doi.html                               doi@win.or.jp