Uh.... I am a Taiwanese and I just tried the Pre-version of Penumbra
(a good name) I think it will be cool if the characters in the game could speak in Chinese. so.... (Is my English good enough to express my opinion?)

well, as far as i know, the only audio speaking that will be in the game is english
and chinese subtitles will take a whil since the game hasent got unicode support

oh well.........

there are plans to add unicode support in the future (at least i think it will :$ )